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From jsto...@apache.org
Subject svn commit: r1811008 [32/43] - in /nifi/site/trunk/docs: ./ nifi-docs/ nifi-docs/components/ nifi-docs/components/org.apache.nifi/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/ nifi-docs/components/org.apache.nifi/nifi-ambari-nar/1.4.0/ nifi-do...
Date Tue, 03 Oct 2017 13:30:27 GMT
Added: nifi/site/trunk/docs/nifi-docs/html/expression-language-guide.html
URL: http://svn.apache.org/viewvc/nifi/site/trunk/docs/nifi-docs/html/expression-language-guide.html?rev=1811008&view=auto
==============================================================================
--- nifi/site/trunk/docs/nifi-docs/html/expression-language-guide.html (added)
+++ nifi/site/trunk/docs/nifi-docs/html/expression-language-guide.html Tue Oct  3 13:30:16 2017
@@ -0,0 +1,3938 @@
+<!--
+                        Licensed to the Apache Software Foundation (ASF) under one or more
+                        contributor license agreements.  See the NOTICE file distributed with
+                        this work for additional information regarding copyright ownership.
+                        The ASF licenses this file to You under the Apache License, Version 2.0
+                        (the "License"); you may not use this file except in compliance with
+                        the License.  You may obtain a copy of the License at
+
+                        http://www.apache.org/licenses/LICENSE-2.0
+
+                        Unless required by applicable law or agreed to in writing, software
+                        distributed under the License is distributed on an "AS IS" BASIS,
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+                        See the License for the specific language governing permissions and
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+                        <!DOCTYPE html>
+<html lang="en">
+<head>
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+<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta name="generator" content="Asciidoctor 1.5.2">
+<meta name="author" content="Apache NiFi Team">
+<title>Apache NiFi Expression Language Guide</title>
+<style>
+/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
+/* Copyright (C) 2012-2015 Dan Allen, Ryan Waldron and the Asciidoctor Project
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+
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+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+</head>
+<body class="article">
+<div id="header">
+<h1>Apache NiFi Expression Language Guide</h1>
+<div class="details">
+<span id="author" class="author">Apache NiFi Team</span><br>
+<span id="email" class="email"><a href="mailto:dev@nifi.apache.org">dev@nifi.apache.org</a></span><br>
+</div>
+<div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+<ul class="sectlevel1">
+<li><a href="expression-language-guide.html#overview">Overview</a></li>
+<li><a href="expression-language-guide.html#structure">Structure of a NiFi Expression</a></li>
+<li><a href="expression-language-guide.html#usage">Expression Language in the Application</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#editor">Expression Language Editor</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#functions">Functions</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#types">Data Types</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#boolean">Boolean Logic</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#isnull">isNull</a></li>
+<li><a href="expression-language-guide.html#notnull">notNull</a></li>
+<li><a href="expression-language-guide.html#isempty">isEmpty</a></li>
+<li><a href="expression-language-guide.html#equals">equals</a></li>
+<li><a href="expression-language-guide.html#equalsignorecase">equalsIgnoreCase</a></li>
+<li><a href="expression-language-guide.html#gt">gt</a></li>
+<li><a href="expression-language-guide.html#ge">ge</a></li>
+<li><a href="expression-language-guide.html#lt">lt</a></li>
+<li><a href="expression-language-guide.html#le">le</a></li>
+<li><a href="expression-language-guide.html#and">and</a></li>
+<li><a href="expression-language-guide.html#or">or</a></li>
+<li><a href="expression-language-guide.html#not">not</a></li>
+<li><a href="expression-language-guide.html#ifelse">ifElse</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#strings">String Manipulation</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#toupper">toUpper</a></li>
+<li><a href="expression-language-guide.html#tolower">toLower</a></li>
+<li><a href="expression-language-guide.html#trim">trim</a></li>
+<li><a href="expression-language-guide.html#substring">substring</a></li>
+<li><a href="expression-language-guide.html#substringbefore">substringBefore</a></li>
+<li><a href="expression-language-guide.html#substringbeforelast">substringBeforeLast</a></li>
+<li><a href="expression-language-guide.html#substringafter">substringAfter</a></li>
+<li><a href="expression-language-guide.html#substringafterlast">substringAfterLast</a></li>
+<li><a href="expression-language-guide.html#getdelimitedfield">getDelimitedField</a></li>
+<li><a href="expression-language-guide.html#append">append</a></li>
+<li><a href="expression-language-guide.html#prepend">prepend</a></li>
+<li><a href="expression-language-guide.html#replace">replace</a></li>
+<li><a href="expression-language-guide.html#replacefirst">replaceFirst</a></li>
+<li><a href="expression-language-guide.html#replaceall">replaceAll</a></li>
+<li><a href="expression-language-guide.html#replacenull">replaceNull</a></li>
+<li><a href="expression-language-guide.html#replaceempty">replaceEmpty</a></li>
+<li><a href="expression-language-guide.html#length">length</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#encode">Encode/Decode Functions</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#escapejson">escapeJson</a></li>
+<li><a href="expression-language-guide.html#escapexml">escapeXml</a></li>
+<li><a href="expression-language-guide.html#escapecsv">escapeCsv</a></li>
+<li><a href="expression-language-guide.html#escapehtml3">escapeHtml3</a></li>
+<li><a href="expression-language-guide.html#escapehtml4">escapeHtml4</a></li>
+<li><a href="expression-language-guide.html#unescapejson">unescapeJson</a></li>
+<li><a href="expression-language-guide.html#unescapexml">unescapeXml</a></li>
+<li><a href="expression-language-guide.html#unescapecsv">unescapeCsv</a></li>
+<li><a href="expression-language-guide.html#unescapehtml3">unescapeHtml3</a></li>
+<li><a href="expression-language-guide.html#unescapehtml4">unescapeHtml4</a></li>
+<li><a href="expression-language-guide.html#urlencode">urlEncode</a></li>
+<li><a href="expression-language-guide.html#urldecode">urlDecode</a></li>
+<li><a href="expression-language-guide.html#base64encode">base64Encode</a></li>
+<li><a href="expression-language-guide.html#base64decode">base64Decode</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#searching">Searching</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#startswith">startsWith</a></li>
+<li><a href="expression-language-guide.html#endswith">endsWith</a></li>
+<li><a href="expression-language-guide.html#contains">contains</a></li>
+<li><a href="expression-language-guide.html#in">in</a></li>
+<li><a href="expression-language-guide.html#find">find</a></li>
+<li><a href="expression-language-guide.html#matches">matches</a></li>
+<li><a href="expression-language-guide.html#indexof">indexOf</a></li>
+<li><a href="expression-language-guide.html#lastindexof">lastIndexOf</a></li>
+<li><a href="expression-language-guide.html#jsonpath">jsonPath</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#numbers">Mathematical Operations and Numeric Manipulation</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#plus">plus</a></li>
+<li><a href="expression-language-guide.html#minus">minus</a></li>
+<li><a href="expression-language-guide.html#multiply">multiply</a></li>
+<li><a href="expression-language-guide.html#divide">divide</a></li>
+<li><a href="expression-language-guide.html#mod">mod</a></li>
+<li><a href="expression-language-guide.html#toradix">toRadix</a></li>
+<li><a href="expression-language-guide.html#fromradix">fromRadix</a></li>
+<li><a href="expression-language-guide.html#random">random</a></li>
+<li><a href="expression-language-guide.html#math">math</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#dates">Date Manipulation</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#format">format</a></li>
+<li><a href="expression-language-guide.html#todate">toDate</a></li>
+<li><a href="expression-language-guide.html#now">now</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#type_cast">Type Coercion</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#tostring">toString</a></li>
+<li><a href="expression-language-guide.html#tonumber">toNumber</a></li>
+<li><a href="expression-language-guide.html#todecimal">toDecimal</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#subjectless">Subjectless Functions</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#ip">ip</a></li>
+<li><a href="expression-language-guide.html#hostname">hostname</a></li>
+<li><a href="expression-language-guide.html#uuid">UUID</a></li>
+<li><a href="expression-language-guide.html#nextint">nextInt</a></li>
+<li><a href="expression-language-guide.html#literal">literal</a></li>
+<li><a href="expression-language-guide.html#getstatevalue">getStateValue</a></li>
+</ul>
+</li>
+<li><a href="expression-language-guide.html#multi">Evaluating Multiple Attributes</a>
+<ul class="sectlevel2">
+<li><a href="expression-language-guide.html#anyattribute">anyAttribute</a></li>
+<li><a href="expression-language-guide.html#allattributes">allAttributes</a></li>
+<li><a href="expression-language-guide.html#anymatchingattribute">anyMatchingAttribute</a></li>
+<li><a href="expression-language-guide.html#allmatchingattributes">allMatchingAttributes</a></li>
+<li><a href="expression-language-guide.html#anydelineatedvalue">anyDelineatedValue</a></li>
+<li><a href="expression-language-guide.html#alldelineatedvalues">allDelineatedValues</a></li>
+<li><a href="expression-language-guide.html#join">join</a></li>
+<li><a href="expression-language-guide.html#count">count</a></li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<div id="content">
+<div class="sect1">
+<h2 id="overview"><a class="anchor" href="expression-language-guide.html#overview"></a>Overview</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>All data in Apache NiFi is represented by an abstraction called a FlowFile.
+A FlowFile is comprised of two major pieces: content and attributes.
+The content portion of the FlowFile represents the data on which to operate.
+For instance, if a file is picked up from a local file system using the
+GetFile Processor, the contents of the file will become the contents of the
+FlowFile.</p>
+</div>
+<div class="paragraph">
+<p>The attributes portion of the FlowFile represents information about the data
+itself, or metadata. Attributes are key-value pairs that represent what is
+known about the data as well as information that is useful for routing and
+processing the data appropriately.
+Keeping with the example of a file that is picked up from
+a local file system, the FlowFile would have an attribute called <code>filename</code> that
+reflected the name of the file on the file system. Additionally, the FlowFile will
+have a <code>path</code> attribute that reflects the directory on the file system that this
+file lived in. The FlowFile will also have an attribute named <code>uuid</code>, which is a
+unique identifier for this FlowFile. For complete listing of the core attributes
+check out the FlowFile section of the <a href="developer-guide.html#flowfile">Developer&#8217;s Guide</a>.</p>
+</div>
+<div class="paragraph">
+<p>However, placing these attributes on a FlowFile do not provide much benefit
+if the user is unable to make use of them. The NiFi Expression Language provides
+the ability to reference these attributes, compare them to other values,
+and manipulate their values.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="structure"><a class="anchor" href="expression-language-guide.html#structure"></a>Structure of a NiFi Expression</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>The NiFi Expression Language always begins with the start delimiter <code>${</code> and ends
+with the end delimiter <code>}</code>. Between the start and end delimiters is the text of the
+Expression itself. In its most basic form, the Expression can consist of just an
+attribute name. For example, <code>${filename}</code> will return the value of the &#8220;filename&#8221;
+attribute.</p>
+</div>
+<div class="paragraph">
+<p>In a slightly more complex example, we can instead return a manipulation of this value.
+We can, for example, return an all upper-case version of the filename by calling the
+<code>toUpper</code> function: <code>${filename:toUpper()}</code>. In this case, we reference the &#8220;filename&#8221;
+attribute and then manipulate this value by using the <code>toUpper</code> function. A function call
+consists of 5 elements. First, there is a function call delimiter <code>:</code>. Second is the name
+of the function - in this case, &#8220;toUpper&#8221;. Next is an open parenthesis (<code>(</code>), followed
+by the function arguments. The arguments necessary are dependent upon which function
+is being called. In this example, we are using the <code>toUpper</code> function, which does not
+have any arguments, so this element is omitted. Finally, the closing parenthesis (<code>)</code>)
+indicates the end of the function call. There are many different functions that are supported
+by the Expression Language to achieve many different goals. Some functions provide String (text)
+manipulation, such as the <code>toUpper</code> function. Others, such as the <code>equals</code> and <code>matches</code> functions,
+provide comparison functionality. Functions also exist for manipulating dates and times and
+for performing mathematical operations. Each of these functions is described below, in the
+<a href="expression-language-guide.html#functions">Functions</a> section, with an explanation of what the function does, the arguments that it
+requires, and the type of information that it returns.</p>
+</div>
+<div class="paragraph">
+<p>When we perform a function call on an attribute, as above, we refer to the attribute as the
+<em>subject</em> of the function, as the attribute is the entity on which the function is operating.
+We can then chain together multiple function calls, where the return value of the first function
+becomes the subject of the second function and its return value becomes the subject of the third
+function and so on. Continuing with our example, we can chain together multiple functions by using
+the expression <code>${filename:toUpper():equals('HELLO.TXT')}</code>. There is no limit to the number of
+functions that can be chained together.</p>
+</div>
+<div class="paragraph">
+<p>Any FlowFile attribute can be referenced using the Expression Language. However, if the attribute
+name contains a &#8220;special character,&#8221; the attribute name must be escaped by quoting it. The following
+characters are each considered &#8220;special characters&#8221;:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>$ (dollar sign)</p>
+</li>
+<li>
+<p>| (pipe)</p>
+</li>
+<li>
+<p>{ (open brace)</p>
+</li>
+<li>
+<p>} (close brace)</p>
+</li>
+<li>
+<p>( (open parenthesis)</p>
+</li>
+<li>
+<p>) (close parenthesis)</p>
+</li>
+<li>
+<p>[ (open bracket)</p>
+</li>
+<li>
+<p>] (close bracket)</p>
+</li>
+<li>
+<p>, (comma)</p>
+</li>
+<li>
+<p>: (colon)</p>
+</li>
+<li>
+<p>; (semicolon)</p>
+</li>
+<li>
+<p>/ (forward slash)</p>
+</li>
+<li>
+<p>* (asterisk)</p>
+</li>
+<li>
+<p>' (single quote)</p>
+</li>
+<li>
+<p>(space)</p>
+</li>
+<li>
+<p>\t (tab)</p>
+</li>
+<li>
+<p>\r (carriage return)</p>
+</li>
+<li>
+<p>\n (new-line)</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>Additionally, a number is considered a &#8220;special character&#8221; if it is the first character of the attribute name.
+If any of these special characters is present in an attribute is quoted by using either single or double quotes.
+The Expression Language allows single quotes and double quotes to be used interchangeably. For example, the following
+can be used to escape an attribute named &#8220;my attribute&#8221;: <code>${"my attribute"}</code> or <code>${'my attribute'}</code>.</p>
+</div>
+<div class="paragraph">
+<p>In this example, the value to be returned is the value of the "my attribute" value, if it exists. If that attribute
+does not exist, the Expression Language will then look for a System Environment Variable named "my attribute." If
+unable to find this, it will look for a JVM System Property named "my attribute." Finally, if none of these exists,
+the Expression Language will return a <code>null</code> value.</p>
+</div>
+<div class="paragraph">
+<p>There also exist some functions that expect to have no subject. These functions are invoked simply
+by calling the function at the beginning of the Expression, such as <code>${hostname()}</code>. These functions
+can then be changed together, as well. For example, <code>${hostname():toUpper()}</code>. Attempting to
+evaluate the function with subject will result in an error. In the <a href="expression-language-guide.html#functions">Functions</a>
+section below, these functions will clearly indicate in their descriptions that they do not
+require a subject.</p>
+</div>
+<div class="paragraph">
+<p>Often times, we will need to compare the values of two different attributes to each other.
+We are able to accomplish this by using embedded Expressions. We can, for example, check if
+the &#8220;filename&#8221; attribute is the same as the &#8220;uuid&#8221; attribute: <code>${filename:equals( ${uuid} )}</code>.
+Notice here, also, that we have a space between the opening parenthesis for the <code>equals</code> method and
+the embedded Expression. This is not necessary and does not affect how the Expression is evaluated
+in any way. Rather, it is intended to make the Expression easier to read. White space is ignored by
+the Expression Language between delimiters. Therefore, we can use the Expression
+<code>${     filename   : equals(${    uuid})  }</code> or <code>${filename:equals(${uuid})}</code> and both Expressions
+mean the same thing. We cannot, however, use <code>${file name:equals(${uuid})}</code>, because this results
+in <code>file</code> and <code>name</code> being interpreted as different tokens, rather than a single token, <code>filename</code>.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="usage"><a class="anchor" href="expression-language-guide.html#usage"></a>Expression Language in the Application</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>The Expression Language is used heavily throughout the NiFi application for configuring Processor
+properties. Not all Processor properties support the Expression Language, however. Whether or not
+a Property supports the Expression Language is determined by the developer of the Processor when
+the Processor is written. However, the application strives to clearly illustrate for each Property
+whether or not the Expression Language is supported.</p>
+</div>
+<div class="paragraph">
+<p>In the application, when configuring a Processor property, the User Interface provides an Information
+icon (
+<span class="image"><img src="images/iconInfo.png" alt="Info"></span>
+) next to the name of the Property. Hovering over this icon with the mouse will provide a tooltip that
+provides helpful information about the Property. This information includes a description of the Property,
+the default value (if any), historically configured values (if any), and whether or not this Property
+supports the expression language.</p>
+</div>
+<div class="sect2">
+<h3 id="editor"><a class="anchor" href="expression-language-guide.html#editor"></a>Expression Language Editor</h3>
+<div class="paragraph">
+<p>When configuring the value of a Processor property, the NiFi User Interface provides help with the
+Expression Language using the Expression Language editor. Once an Expression is begin by typing <code>${</code>,
+the editor begins to highlight parentheses and braces so that the user is easily able to tell which
+opening parenthesis or brace matches which closing parenthesis or brace.</p>
+</div>
+<div class="paragraph">
+<p>The editor also supplies context-sensitive help by providing a list of all functions that can be used
+at the current cursor position. To activate this feature, press Ctrl+Space on the keyboard. The user
+is also able to type part of a function name and then press Ctrl+Space to see all functions that can
+be used that start with the same prefix. For example, if we type into the editor <code>${filename:to</code>
+and then press Ctrl+Space, we are provided a pop-up that lists six different functions: <code>toDate</code>,
+<code>toLower</code>, <code>toNumber</code>, <code>toRadix</code>, <code>toString</code>, and <code>toUpper</code>. We can then continue typing to narrow
+which functions are shown, or we can select one of the functions from the list by double-clicking
+it with the mouse or using the arrow keys to highlight the desired function and pressing Enter.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="functions"><a class="anchor" href="expression-language-guide.html#functions"></a>Functions</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Functions provide a convenient way to manipulate and compare values of attributes. The Expression Language
+provides many different functions to meet the needs of a automated dataflow. Each function takes
+zero or more arguments and returns a single value. These functions can then be chained together to create
+powerful Expressions to evaluate conditions and manipulate values. See <a href="expression-language-guide.html#structure">Structure of a NiFi Expression</a> for more information
+on how to call and chain functions together.</p>
+</div>
+<div class="sect2">
+<h3 id="types"><a class="anchor" href="expression-language-guide.html#types"></a>Data Types</h3>
+<div class="paragraph">
+<p>Each argument to a function and each value returned from a function has a specific data type. The Expression
+Language supports four different data types:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><strong>String</strong>: A String is a sequence of characters that can consist of numbers, letters, white space, and
+special characters.</p>
+</li>
+<li>
+<p><strong>Number</strong>: A Number is an whole number comprised of one or more digits (<code>0</code> through <code>9</code>). When converting to numbers from Date data types, they are represented as
+the number of milliseconds since midnight GMT on January 1, 1970.</p>
+</li>
+<li>
+<p><strong>Decimal</strong>: A Decimal is a numeric value that can support decimals and larger values with minimal loss of precision. More precisely it
+is a double-precision 64-bit IEEE 754 floating point. Due to this minimal loss of precision this data type should not be used for
+very precise values, such as currency. For more documentation on the range of values stored in this data type
+refer to this <a href="https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.2.3">link</a>. The following are some examples of the forms of
+literal decimals that are supported in expression language (the "E" can also be lower-case):</p>
+<div class="ulist">
+<ul>
+<li>
+<p>1.1</p>
+</li>
+<li>
+<p>.1E1</p>
+</li>
+<li>
+<p>1.11E-12</p>
+</li>
+</ul>
+</div>
+</li>
+<li>
+<p><strong>Date</strong>: A Date is an object that holds a Date and Time. Utilizing the <a href="expression-language-guide.html#dates">Date Manipulation</a> and <a href="expression-language-guide.html#type_cast">Type Coercion</a> functions this data
+type can be converted to/from Strings and numbers. If the whole Expression Language expression is evaluated to be a
+date then it will be converted to a String with the format: "&lt;Day of Week&gt; &lt;Month&gt; &lt;Day of Month&gt; &lt;Hour&gt;:&lt;Minute&gt;:&lt;Second&gt; &lt;Time Zone&gt; &lt;Year&gt;".
+Also expressed as "E MMM dd HH:mm:ss z yyyy" in Java SimpleDateFormat format. For example: "Wed Dec 31 12:00:04 UTC 2016".</p>
+</li>
+<li>
+<p><strong>Boolean</strong>: A Boolean is one of either <code>true</code> or <code>false</code>.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>After evaluating expression language functions, all attributes are stored as type String.</p>
+</div>
+<div class="paragraph">
+<p>The Expression Language is generally able to automatically coerce a value of one data type to the appropriate
+data type for a function. However, functions do exist to manually coerce a value into a specific data type.
+See the <a href="expression-language-guide.html#type_cast">Type Coercion</a> section for more information.</p>
+</div>
+<div class="paragraph">
+<p>Hex values are supported for Number and Decimal types but they must be quoted and prepended with "0x" when being
+interpreted as literals. For example these two expressions are valid (without the quotes or "0x" the expression would fail to run properly):</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>${literal("0xF"):toNumber()}</p>
+</li>
+<li>
+<p>${literal("0xF.Fp10"):toDecimal()}</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="boolean"><a class="anchor" href="expression-language-guide.html#boolean"></a>Boolean Logic</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>One of the most powerful features of the Expression Language is the ability to compare an attribute value against
+some other value. This is used often, for example, to configure how a Processor should route data. The following
+functions are used for performing boolean logic, such as comparing two values.
+Each of these functions are designed to work on values of type Boolean.</p>
+</div>
+<div class="sect2 function">
+<h3 id="isnull"><a class="anchor" href="expression-language-guide.html#isnull"></a>isNull</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>isNull</code> function returns <code>true</code> if the subject is null, <code>false</code> otherwise. This is typically used to determine
+if an attribute exists.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Any</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>:	<code>${filename:isNull()}</code> returns <code>true</code> if the "filename" attribute does not exist.
+	It returns <code>false</code> if the attribute exists.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="notnull"><a class="anchor" href="expression-language-guide.html#notnull"></a>notNull</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>notNull</code> function returns the opposite value of the <code>isNull</code> function. That is, it will return <code>true</code> if the
+subject exists and <code>false</code> otherwise.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Any</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${filename:notNull()}</code> returns <code>true</code> if the "filename" attribute exists. It returns <code>false</code> if the attribute
+	does not exist.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="isempty"><a class="anchor" href="expression-language-guide.html#isempty"></a>isEmpty</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>isEmpty</code> function returns <code>true</code> if the Subject is null, does not contain any characters
+	or contains only white-space (new line, carriage return, space, tab), <code>false</code> otherwise.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${filename:isEmpty()}</code> returns <code>true</code> if the "filename" attribute does not exist or contains only
+	white space. <code>${literal(" "):isEmpty()}</code> returns true as well as <code>${literal(""):isEmpty()}</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="equals"><a class="anchor" href="expression-language-guide.html#equals"></a>equals</h3>
+<div class="paragraph description">
+<p><strong>Description</strong>: <span class="description">The <code>equals</code> function is very widely used and determines if its subject is equal to another String value.
+	Note that the <code>equals</code> function performs a direct comparison of two String values. Take care not to confuse this
+	function with the <a href="expression-language-guide.html#matches">matches</a> function, which evaluates its subject against a Regular Expression.</span></p>
+</div>
+<div class="paragraph subject">
+<p><strong>Subject Type</strong>: <span class="subject">Any</span></p>
+</div>
+<div class="paragraph arguments">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The value to compare the Subject to. Must be same type as the Subject.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph returnType">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph examples">
+<p><strong>Examples</strong>:
+We can check if the filename of a FlowFile is "hello.txt" by using the expression <code>${filename:equals('hello.txt')}</code>,
+or we could check if the value of the attribute <code>hello</code> is equal to the value of the <code>filename</code> attribute:
+<code>${hello:equals( ${filename} )}</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="equalsignorecase"><a class="anchor" href="expression-language-guide.html#equalsignorecase"></a>equalsIgnoreCase</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Similar to the <code>equals</code> function, the <code>equalsIgnoreCase</code> function compares its subject against a String value but returns
+<code>true</code> if the two values differ only by case (upper case vs. lower case).</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The value to compare the Subject to.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${filename:equalsIgnoreCase('hello.txt')}</code> will evaluate to <code>true</code> if filename is equal to "hello.txt"
+	or "HELLO.TXT" or "HeLLo.TxT".</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="gt"><a class="anchor" href="expression-language-guide.html#gt"></a>gt</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>gt</code> function is used for numeric comparison and returns <code>true</code> if the subject is Greater Than
+	its argument. If either the subject or the argument cannot be coerced into a Number,
+	this function returns <code>false</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Number</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The number to compare the Subject to.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${fileSize:gt( 1024 )}</code> will return <code>true</code> if the size of the FlowFile&#8217;s content is more than 1 kilobyte
+	(1024 bytes). Otherwise, it will return <code>false</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="ge"><a class="anchor" href="expression-language-guide.html#ge"></a>ge</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>ge</code> function is used for numeric comparison and returns <code>true</code> if the subject is Greater Than
+	Or Equal To its argument. If either the subject or the argument cannot be coerced into a Number,
+	this function returns <code>false</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Number</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The number to compare the Subject to.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${fileSize:ge( 1024 )}</code> will return <code>true</code> if the size of the FlowFile&#8217;s content is at least (
+	is greater than or equal to) 1 kilobyte (1024 bytes). Otherwise, it will return <code>false</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="lt"><a class="anchor" href="expression-language-guide.html#lt"></a>lt</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>lt</code> function is used for numeric comparison and returns <code>true</code> if the subject is Less Than
+	its argument. If either the subject or the argument cannot be coerced into a Number,
+	this function returns <code>false</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Number</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The number to compare the Subject to.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${fileSize:lt( 1048576 )}</code> will return <code>true</code> if the size of the FlowFile&#8217;s content is less than
+	1 megabyte (1048576 bytes). Otherwise, it will return <code>false</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="le"><a class="anchor" href="expression-language-guide.html#le"></a>le</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>le</code> function is used for numeric comparison and returns <code>true</code> if the subject is Less Than
+	Or Equal To its argument. If either the subject or the argument cannot be coerced into a Number,
+	this function returns <code>false</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Number</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The number to compare the Subject to.</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: <code>${fileSize:le( 1048576 )}</code> will return <code>true</code> if the size of the FlowFile&#8217;s content is at most
+	(less than or equal to) 1 megabyte (1048576 bytes). Otherwise, it will return <code>false</code>.</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="and"><a class="anchor" href="expression-language-guide.html#and"></a>and</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>and</code> function takes as a single argument a Boolean value and returns <code>true</code> if both the Subject
+	and the argument are <code>true</code>. If either the subject or the argument is <code>false</code> or cannot be coerced into a Boolean,
+	the function returns <code>false</code>. Typically, this is used with an embedded Expression as the argument.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>condition</em></span> : <span class="argDesc">The right-hand-side of the <em>and</em> Expression</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: We can check if the filename is both all lower-case and has at least 5 characters by using the Expression</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>${filename:toLower():equals( ${filename} ):and(
+	${filename:length():ge(5)}
+)}</pre>
+</div>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="or"><a class="anchor" href="expression-language-guide.html#or"></a>or</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>or</code> function takes as a single argument a Boolean value and returns <code>true</code> if either the Subject
+	or the argument is <code>true</code>. If both the subject and the argument are <code>false</code>, the function returns <code>false</code>. If
+	either the Subject or the argument cannot be coerced into a Boolean value, this function will return <code>false</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>condition</em></span> : <span class="argDesc">The right-hand-side of the <em>and</em> Expression</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: The following example will return <code>true</code> if either the filename has exactly 5 characters or if
+	the filename is all lower-case.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>${filename:toLower():equals( ${filename} ):or(
+	${filename:length():equals(5)}
+)}</pre>
+</div>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="not"><a class="anchor" href="expression-language-guide.html#not"></a>not</h3>
+<div class="paragraph description">
+<p><strong>Description</strong>: <span class="description">The <code>not</code> function returns the negation of the Boolean value of the subject.</span></p>
+</div>
+<div class="paragraph subject">
+<p><strong>Subject Type</strong>: <span class="subject">Boolean</span></p>
+</div>
+<div class="paragraph arguments">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph returnType">
+<p><strong>Return Type</strong>: <span class="returnType">Boolean</span></p>
+</div>
+<div class="paragraph examples">
+<p><strong>Examples</strong>: We can invert the value of another function by using the <code>not</code> function, as
+	<code>${filename:equals('hello.txt'):not()}</code>. This will return <code>true</code> if the filename is NOT equal to
+	"hello.txt" and will return <code>false</code> if the filename is "hello.txt."</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="ifelse"><a class="anchor" href="expression-language-guide.html#ifelse"></a>ifElse</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Evaluates the first argument if the Subject evaluates to true, or the second argument
+if the Subject evaluates to false.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">Boolean</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>EvaluateIfTrue</em></span> : <span class="argDesc">The value to return if the Subject is true</span></p>
+</li>
+<li>
+<p><span class="argName"><em>EvaluateIfFalse</em></span> : <span class="argDesc">The value to return if the Subject is false</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute has the value "a brand new filename.txt", the "nullFilename" attribute has
+the value null, and the "bool" attribute has the value "true", then the following expressions will provide
+the following results:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 1. ifElse Examples</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Expression</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${bool:ifElse('a','b')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${literal(true):ifElse('a','b')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${nullFilename:isNull():ifElse('file does not exist', 'located file')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>file does not exist</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${nullFilename:ifElse('found', 'not_found')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>not_found</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:ifElse('found', 'not_found')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>not_found</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:isNull():not():ifElse('found', 'not_found')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>found</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="strings"><a class="anchor" href="expression-language-guide.html#strings"></a>String Manipulation</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Each of the following functions manipulates a String in some way.</p>
+</div>
+<div class="sect2 function">
+<h3 id="toupper"><a class="anchor" href="expression-language-guide.html#toupper"></a>toUpper</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">This function converts the Subject into an all upper-case String. Said another way, it
+	replaces any lowercase letter with the uppercase equivalent.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute is "abc123.txt", then the Expression <code>${filename:toUpper()}</code>
+	will return "ABC123.TXT"</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="tolower"><a class="anchor" href="expression-language-guide.html#tolower"></a>toLower</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">This function converts the Subject into an all lower-case String. Said another way,
+	it replaces any uppercase letter with the lowercase equivalent.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute is "ABC123.TXT", then the Expression <code>${filename:toLower()}</code>
+	will return "abc123.txt"</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="trim"><a class="anchor" href="expression-language-guide.html#trim"></a>trim</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">The <code>trim</code> function will remove any leading or trailing white space from its subject.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>: No arguments</p>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the attribute <code>attr</code> has the value "     1 2 3     ", then the Expression <code>${attr:trim()}</code> will
+	return the value "1 2 3".</p>
+</div>
+</div>
+<div class="sect2 function">
+<h3 id="substring"><a class="anchor" href="expression-language-guide.html#substring"></a>substring</h3>
+<div class="paragraph">
+<p><strong>Description</strong>:
+<span class="description">Returns a portion of the Subject, given a <em>starting index</em> and an optional <em>ending index</em>.
+	If the <em>ending index</em> is not supplied, it will return the portion of the Subject starting at the given
+	<em>start index</em> and ending at the end of the Subject value.</span></p>
+</div>
+<div class="paragraph">
+<p><span class="description">The <em>starting index</em> and <em>ending index</em> are zero-based. That is, the first character is referenced by using
+	the value <code>0</code>, not <code>1</code>.</span></p>
+</div>
+<div class="paragraph">
+<p><span class="description">If either the <em>starting index</em> is or the <em>ending index</em> is not a number, this function call will result
+	in an error.</span></p>
+</div>
+<div class="paragraph">
+<p><span class="description">If the <em>starting index</em> is larger than the <em>ending index</em>, this function call will result in an error.</span></p>
+</div>
+<div class="paragraph">
+<p><span class="description">If the <em>starting index</em> or the <em>ending index</em> is greater than the length of the Subject or has a value
+	less than 0, this function call will result in an error.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>starting index</em></span> : <span class="argDesc">The 0-based index of the first character to capture (inclusive)</span></p>
+</li>
+<li>
+<p><span class="argName"><em>ending index</em></span> : <span class="argDesc">The 0-based index of the last character to capture (exclusive)</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>:</p>
+</div>
+<div class="paragraph">
+<p>If we have an attribute named "filename" with the value "a brand new filename.txt",
+then the following Expressions will result in the following values:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 2. Substring Examples</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Expression</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substring(0,1)}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substring(2)}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>brand new filename.txt</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substring(12)}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>filename.txt</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substring( ${filename:length():minus(2)} )}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>xt</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2 function">
+<h3 id="substringbefore"><a class="anchor" href="expression-language-guide.html#substringbefore"></a>substringBefore</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Returns a portion of the Subject, starting with the first character of the Subject
+	and ending with the character immediately before the first occurrence of the argument. If
+	the argument is not present in the Subject, the entire Subject will be returned.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The String to search for in the Subject</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute has the value "a brand new filename.txt",
+	then the following Expressions will result in the following values:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 3. SubstringBefore Examples</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Expression</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBefore('.')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new filename</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBefore(' ')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBefore(' n')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBefore('missing')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new filename.txt</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2 function">
+<h3 id="substringbeforelast"><a class="anchor" href="expression-language-guide.html#substringbeforelast"></a>substringBeforeLast</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Returns a portion of the Subject, starting with the first character of the Subject
+	and ending with the character immediately before the last occurrence of the argument. If
+	the argument is not present in the Subject, the entire Subject will be returned.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The String to search for in the Subject</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute has the value "a brand new filename.txt",
+	then the following Expressions will result in the following values:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 4. SubstringBeforeLast Examples</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Expression</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBeforeLast('.')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new filename</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBeforeLast(' ')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBeforeLast(' n')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringBeforeLast('missing')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new filename.txt</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2 function">
+<h3 id="substringafter"><a class="anchor" href="expression-language-guide.html#substringafter"></a>substringAfter</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Returns a portion of the Subject, starting with the character immediately after
+	the first occurrence of the argument and extending to the end of the Subject. If
+	the argument is not present in the Subject, the entire Subject will be returned.</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Subject Type</strong>: <span class="subject">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Arguments</strong>:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><span class="argName"><em>value</em></span> : <span class="argDesc">The String to search for in the Subject</span></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>Return Type</strong>: <span class="returnType">String</span></p>
+</div>
+<div class="paragraph">
+<p><strong>Examples</strong>: If the "filename" attribute has the value "a brand new filename.txt",
+	then the following Expressions will result in the following values:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 5. SubstringAfter Examples</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Expression</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Value</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringAfter('.')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>txt</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringAfter(' ')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>brand new filename.txt</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringAfter(' n')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>ew filename.txt</code></p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>${filename:substringAfter('missing')}</code></p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><code>a brand new filename.txt</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="sect2 function">
+<h3 id="substringafterlast"><a class="anchor" href="expression-language-guide.html#substringafterlast"></a>substringAfterLast</h3>
+<div class="paragraph">
+<p><strong>Description</strong>: <span class="description">Returns a portion of the Subject, starting with the character immediately after

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