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Date: Wed, 29 Sep 2010 19:46:37 -0400 (EDT)
From: "Hoss Man (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-2093) regular expression in
 PatternReplaceFilter can handle: /([^/]*)
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    [ https://issues.apache.org/jira/browse/SOLR-2093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916309#action_12916309 ] 

Hoss Man commented on SOLR-2093:
--------------------------------

Note: Part of your confusion may lie in the meaning behind {{replace="all"}} ... this doesn't mean replace the entire Token, this means replace all matches of the regex with the replacement value -- so the pattern will be evaluated over and over against the input string (starting at the end of the last match) until it no longer matches, and each match will result in a replacement.

If you want the entire input Token to be replaced by the parenthetical group, you need to anchor your regex at both ends.  This should work..

{noformat}
<filter class="solr.PatternReplaceFilterFactory"
        pattern="^.*/([^/]*)/[^/]*$" replacement="$1" replace="all" />
{noformat}

> regular expression in PatternReplaceFilter can handle: /([^/]*)
> ---------------------------------------------------------------
>
>                 Key: SOLR-2093
>                 URL: https://issues.apache.org/jira/browse/SOLR-2093
>             Project: Solr
>          Issue Type: Bug
>          Components: Schema and Analysis
>    Affects Versions: 1.4
>         Environment: debian,JRE1.6,solr1.4
>            Reporter: Kuri Masta
>            Priority: Minor
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Using PatternReplaceFilter i want to extract a certain word out of the URI.
> Although I now understand that I should handle this outside of Solr, the fact remains that Solr does not adequately handle regular expressions.
> Viewing the source code, I don't see any problems since it uses the java library.
> The problem:
>       <analyzer type="index">
>         <tokenizer class="solr.WhitespaceTokenizerFactory"/>
>         <filter class="solr.PatternReplaceFilterFactory"
>                         pattern="/([^/]*)/[^/]*$" replacement="$1"  replace="all" />
>       </analyzer>
> Input text:
> - a/b/c
> Expected
> - b
> Result Solr
> - ab
> An online JAVA regexp tester (http://www.regexplanet.com/simple/index.html):
> - b
> So the problem area lies at /([^/])

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