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From "Bill Graham (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-2905) Improve documentation around REPLACE
Date Tue, 04 Sep 2012 18:03:07 GMT
Bill Graham created PIG-2905:
--------------------------------

             Summary: Improve documentation around REPLACE
                 Key: PIG-2905
                 URL: https://issues.apache.org/jira/browse/PIG-2905
             Project: Pig
          Issue Type: Sub-task
            Reporter: Bill Graham


Document how REPLACE uses a Java regex and link out to JDK docs describing reserved characters
and escaping. From recent confusion on the users list:
{noformat}
> String source = "[02/Aug/2012:05:01:17";
> > String target ="[";
> > String replaceWith = "";
> > return source.replaceAll(source, target, replaceWith);


> Note that Java String.replaceAll() takes a regular expression for the 2nd
> parameter (i.e. target), and "[" is a special character. To use it as is,
> you have to escape it, so in your Pig script, you should do:

> REPLACE(date,'\\[','')
{noformat} 

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