Hello, I saw the following thread talking about how to set regex to work in perl extended mode:<br><br><a href="http://groups.google.com/group/boost-list/browse_thread/thread/4d5588fb70211e02/2c4a6026becb9bd4?lnk=st&amp;q=&amp;rnum=2#2c4a6026becb9bd4">
http://groups.google.com/group/boost-list/browse_thread/thread/4d5588fb70211e02/2c4a6026becb9bd4?lnk=st&amp;q=&amp;rnum=2#2c4a6026becb9bd4</a><br><br>I am using 1.28.0 and has coded something like this already:<br><br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; boost::RegEx expr(is10k ? keywords_10k[i].m_Key :
<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; keywords_10q[i].m_Key, true);<br><br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // Pass callback, strings to RegEx library<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; unsigned int result = expr.Grep(cb, pBuf);<br>
<br><br>question is how do I set this boost::regex_constants::perl like the follow example:<br><br><font class="fixed_width" face="Courier, Monospaced">boost::regex rxBlah(&quot;([a-z](?:_?[a-z0-9])*)_dvs&quot;, <br> &nbsp; &nbsp;boost::regex_constants::perl | boost::regex_constants::icase); 
</font><br><br>/Winson<br>