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https://issues.apache.org/jira/browse/WW-4101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681092#comment-13681092
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Maurizio Cucchiara commented on WW-4101:
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I didn't see many options here: validators are instanciated per request and per
field as well, hence Struts for every regex validations (a) builds a new RFV
(b) sets the regex string (c) compile the regex.
I took a quick look at the implementation and AFAICS there can be at least one
compilation, whenever it occurs doesn't matter.
> RegexFieldValidator should precompile patterns
> ----------------------------------------------
>
> Key: WW-4101
> URL: https://issues.apache.org/jira/browse/WW-4101
> Project: Struts 2
> Issue Type: Improvement
> Components: Core Actions
> Affects Versions: 2.3.14.3
> Reporter: Marcin Kamionowski
> Fix For: 2.3.16
>
>
> RegexFieldValidator compile pattern for each execution of method validate so
> it's much slower.
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