28 Regular expressions library [re]

28.8 Class template basic_regex [re.regex]

28.8.4 basic_regex constant operations [re.regex.operations]

unsigned mark_count() const;

Effects: Returns the number of marked sub-expressions within the regular expression.

flag_type flags() const;

Effects: Returns a copy of the regular expression syntax flags that were passed to the object's constructor or to the last call to assign.