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Why can I use the “convenience” versions of regex_match / regex_search / regex_grep / regex_format / regex_merge?

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Why can I use the “convenience” versions of regex_match / regex_search / regex_grep / regex_format / regex_merge?

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A. These versions may or may not be available depending upon the capabilities of your compiler, the rules determining the format of these functions are quite complex – and only the versions visible to a standard compliant compiler are given in the help. To find out what your compiler supports, run through your C++ pre-processor, and search the output file for the function that you are interested in. Note however, that very few current compilers still have problems with these overloaded functions.

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