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e1938aa240
Only enable std::regex when the header <regex> is present (fix Mac OS X issue). Remove support for concept checks. The page https://gcc.gnu.org/onlinedocs/libstdc++/manual/concept_checking.html says about concept checking: Please note that the checks are based on the requirements in the original C++ standard, many of which were relaxed in the C++11 standard and so valid C++11 code may be incorrectly rejected by the concept checks. Additionally, some correct C++03 code might be rejected by the concept checks, for example template argument types may need to be complete when used in a template definition, rather than at the point of instantiation. There are no plans to address these shortcomings. Therefore it seems reasonable to remove our support for this.