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https://issues.apache.org/jira/browse/WW-3529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17621490#comment-17621490
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ASF subversion and git services commented on WW-3529:
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Commit 993c4c4cab21ace8970d094da03291b21547ab83 in struts's branch
refs/heads/master from Lukasz Lenart
[ https://gitbox.apache.org/repos/asf?p=struts.git;h=993c4c4ca ]
WW-3529 Fixes using RegEx related characters in named pattern
> NamedVariablePatternMatcher does not properly escape characters
> ---------------------------------------------------------------
>
> Key: WW-3529
> URL: https://issues.apache.org/jira/browse/WW-3529
> Project: Struts 2
> Issue Type: Bug
> Components: Other
> Affects Versions: 2.2.1
> Reporter: Richard Vermillion
> Priority: Major
> Fix For: 6.1.0
>
> Attachments: NamedVariablePatternMatcher.patch
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The {{com.opensymphony.xwork2.util.NamedVariablePatternMatcher}} class has a
> bug in the {{compilePattern(String)}} method. The purpose of the method is to
> compile patterns such as {{"action/\{foo}"}} to a regular expression Pattern
> and extract the variable names that match each group in the regex. In the
> example given and the 2.2.1 code base, the pattern will be compiled as
> {{{}"action/([^/]+)"{}}}. However, if the pattern includes characters that
> have special meaning to Java's regular expression engine, they are currently
> not being escaped.
> For example, the pattern {{"action.\{format}"}} is being compiled to
> {{"action.([^/]{+})"{+}}} which correctly matches {{"action.html"}} but also
> {{"actionK.html"}} or any other character because the {{'.'}} is not escaped.
> The bug really bites when a pattern like {{"\{name}.\{format}"}} is used.
> This will be compiled to {{"([^/]).([^/]+)"}} which will match
> {{"cars.html"}} but not the way you expect. Because of greediness, it will
> set {{name = "cars.ht"}} and {{{}format = "l"{}}}.
> I will submit a patch to fix this behavior on the next screen.
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