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https://issues.apache.org/jira/browse/SOLR-6383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564844#comment-14564844
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Jens commented on SOLR-6383:
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I would also prefer the previous behaviour as it was added in SOLR-1080
> regexTransformer returns no results if there is no match
> --------------------------------------------------------
>
> Key: SOLR-6383
> URL: https://issues.apache.org/jira/browse/SOLR-6383
> Project: Solr
> Issue Type: Bug
> Reporter: Alexander Kingson
> Assignee: Shalin Shekhar Mangar
> Fix For: 4.10, Trunk
>
> Attachments: SOLR-6383.patch, regexTransformer.patch
>
>
> When used in data-import config file to replace spaces in title with _
>
> <field column="title_underscore" regex="\s+" replaceWith="_"
> sourceColName="title" />
> regexTransformer returns empty results for titles without spaces, i.e. when
> there is no match for the regex. According to the description it is
> equivalent to replaceAll which returns string when there is no match.
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