Boost C++ Libraries: Ticket #12965: bug of [[:xdigit:]] matching https://svn.boost.org/trac10/ticket/12965 <blockquote> <p> boost::regex myRegex{ "<a class="missing wiki">:xdigit:</a>{ 1,2 }" };<em> string s = "\xca\xd5"; </em></p> </blockquote> <blockquote> <p> cout &lt;&lt; boost::regex_match(s,myRegex) &lt;&lt; endl; </p> </blockquote> en-us Boost C++ Libraries /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/12965 Trac 1.4.3 John Maddock Sun, 16 Apr 2017 08:53:26 GMT component changed; owner set https://svn.boost.org/trac10/ticket/12965#comment:1 https://svn.boost.org/trac10/ticket/12965#comment:1 <ul> <li><strong>owner</strong> set to <span class="trac-author">John Maddock</span> </li> <li><strong>component</strong> <span class="trac-field-old">None</span> → <span class="trac-field-new">regex</span> </li> </ul> Ticket John Maddock Tue, 01 Aug 2017 18:47:40 GMT <link>https://svn.boost.org/trac10/ticket/12965#comment:2 </link> <guid isPermaLink="false">https://svn.boost.org/trac10/ticket/12965#comment:2</guid> <description> <p> Unless the wiki has mangled your text somehow, that's not a valid regular expression. </p> </description> <category>Ticket</category> </item> </channel> </rss>