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<p style="margin: 10px 0 0 0">Hi Scott,</p>
<p style="margin: 10px 0 0 0">With some searching, I found that:</p>
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Xerces release notes <span class="error">[1]</span> claim that regexp flavour is " XPath 2.0-compatible one" since 3.0.0 <span class="error">[2]</span>.
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Xerces documentation <span class="error">[3]</span> points to "The XPath 2.0 / XQuery regular expression syntax" <span class="error">[4]</span>
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<p style="margin: 10px 0 0 0"><span class="error">[4]</span> appears to be a reasonable ?subset? of the Java regexp syntax <span class="error">[5]</span>, so I'm wondering whether we should use <span class="error">[4]</span> as the reference link in the documentation ?<br /> I would see this as clearly apply to the SP Attribute Filter documentation <span class="error">[6]</span>; unsure about IdP documentation where the rules are specified and executed locally, with a clear binding to Java...</p>
<p style="margin: 10px 0 0 0">Cheers,<br /> Vlad</p>
<p style="margin: 10px 0 0 0"><span class="error">[1]</span>: <a href="https://xerces.apache.org/xerces-c/releases_archive.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://xerces.apache.org/xerces-c/releases_archive.html</a><br /> <span class="error">[2]</span>: <a href="https://issues.apache.org/jira/browse/XERCESC-1816" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://issues.apache.org/jira/browse/XERCESC-1816</a><br /> <span class="error">[3]</span>: <a href="http://xerces-c.sourcearchive.com/documentation/3.0.0/classRegularExpression.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://xerces-c.sourcearchive.com/documentation/3.0.0/classRegularExpression.html</a><br /> <span class="error">[4]</span>: <a href="https://www.w3.org/TR/xpath-functions/#regex-syntax" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://www.w3.org/TR/xpath-functions/#regex-syntax</a><br /> <span class="error">[5]</span>: <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html</a><br /> <span class="error">[6]</span>: <a href="https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPAttributeFilter" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPAttributeFilter</a></p>
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