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[re.regex.operations]

28 Text processing library [text]

28.6 Regular expressions library [re]

28.6.7 Class template basic_regex [re.regex]

28.6.7.4 Constant operations [re.regex.operations]

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unsigned mark_count() const;

1

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

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flag_type flags() const;

2

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.