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https://issues.apache.org/jira/browse/SOLR-13242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766236#comment-16766236
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Erick Erickson commented on SOLR-13242:
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Have you tried running this in a Java program rather than an online emulator?
This pattern is suspect "(\s*\n)\{2,}". "\s" _includes_ newlines so I doubt
it's doing what you expect.
> RegexReplaceProcessorFactory not making accurate replacement
> ------------------------------------------------------------
>
> Key: SOLR-13242
> URL: https://issues.apache.org/jira/browse/SOLR-13242
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.6
> Reporter: Edwin Yeo Zheng Lin
> Priority: Major
> Labels: regex, solr
>
> We are using the RegexReplaceProcessorFactory with the following configuration
>
> <processor class="solr.RegexReplaceProcessorFactory">
> <str name="fieldName">content</str>
> <str name="pattern">(\s*\n)\{2,}</str>
> <str name="replacement"><br><br></str>
> </processor>
>
> The regex pattern of (\s*\n)\{2,} is working perfectly in
> [regex101.com|http://regex101.com/], in which all the \n will be replaced by
> only two <br>
> However, in Solr, there are cases (in Example 2 and 3 below) that has four
> <br> in a row. This should not be the case, as we have already set it to
> replace by two <br> regardless of how many \n are there in a row.
>
>
> Example 1: The sentence that the above regex pattern is working correctly
> *Original content in EML file:*
> Dear Sir,
>
> I am terminating
> *Original content:* Dear Sir, \n\n \n \n\n I am terminating
> *Index content:* Dear Sir, <br><br>I am terminating
>
> Example 2: The sentence that the above regex pattern is partially working (as
> you can see, instead of 2 <br>, there are 4 <br>)
> *Original content in EML file:*
> _exalted_
> _Psalm 89:17_
>
> 3 Choa Chu Kang Avenue 4
> *Original content:* exalted \n \n\n Psalm 89:17 \n\n \n\n 3 Choa Chu
> Kang Avenue 4, Singapore
> *Index content:* exalted <br><br>Psalm 89:17 <br><br> <br><br>3 Choa Chu
> Kang Avenue 4, Singapore
>
> Example 3: The sentence that the above regex pattern is partially working (as
> you can see, instead of 2 <br>, there are 4 <br>)
> *Original content in EML file:*
> [http://www.concordpri.moe.edu.sg/]
>
>
>
>
> On Tue, Dec 18, 2018 at 10:07 AM
> *Original content:* [http://www.concordpri.moe.edu.sg/] \n\n \n\n \n \n\n
> \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n \n\n\n On Tue, Dec 18, 2018
> at 10:07 AM
> *Index content:* [http://www.concordpri.moe.edu.sg/] <br><br> <br><br>On
> Tue, Dec 18, 2018 at 10:07 AM
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