Is auto as a parameter in a regular function a GCC 4.9 extension?
Yes, this is an extension. It’s likely to be added to C++17 as part of the ‘concepts’ proposal, I believe.
gcc4.9
Difference between std::regex_match & std::regex_search?
regex_match only returns true when the entire input sequence has been matched, while regex_search will succeed even if only a sub-sequence matches the regex. Quoting from N3337, ยง28.11.2/2 regex_match [re.alg.match] Effects: Determines whether there is a match between the regular expression e, and all of the character sequence [first,last). … Returns true if such a … Read more