<regex>: Fix pointer-size constructor of basic_regex and remove error_parse
#5211
+28
−9
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error_parseis a non-reserved identifier that is not used by the standard library. I think it's better to remove its use. Perhaps it would also be better to removeerror_syntax, but see #438.Per [re.regex.construct]/6, the call to the pointer-size constructor of
basic_regexshould be well-defined whenpis null andlenis0. This PR makes such case accepted and makes some UB case diagnosed with_STL_VERIFY.Drive-by: Strengthening exception specification of
regex_error::code.