Difference between regex_match and regex_search?

Question

I was experimenting with regular expression in trying to make an answer to this question, and found that while regex_match finds a match, regex_search

Answer 1

Looking through the latest libstdc++ source code for regex_search, you will find:

* @todo Implement this function.

Unfortunately this is not the only TODO item left. GCC's implementation is currently incomplete. I recommend using Boost or Clang and #ifdef the code until GCC has caught up.

(This has neither been fixed in the 4.8 branch.)