30 Regular expressions library [re]

30.9 Class template sub_­match [re.submatch]

30.9.1 Members [re.submatch.members]

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constexpr sub_match();
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Effects: Value-initializes the pair base class subobject and the member matched.
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difference_type length() const;
2
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Returns: matched ? distance(first, second) : 0.
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operator string_type() const;
3
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Returns: matched ? string_­type(first, second) : string_­type().
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string_type str() const;
4
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Returns: matched ? string_­type(first, second) : string_­type().
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int compare(const sub_match& s) const;
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Returns: str().compare(s.str()).
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int compare(const string_type& s) const;
6
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Returns: str().compare(s).
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int compare(const value_type* s) const;
7
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Returns: str().compare(s).