title: What part of regex is supported by GCC 4.9?
body: <p>I don't get this. GCC is supposed to support  but accoriding to their
  <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr1" rel="nofollow">http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr1</a></p>
  
  <p>Status page  "7 Regular Expressions are not supported".</p>
  
  <p>But then at "28 Regular expressions" - they are checked as supported</p>
  
  <p><a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011" rel="nofollow">http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011</a></p>
  
  <p>Could you please explain what is actually the standard and what is not?</p>