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std::match_results::length

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< cpp‎ | regex‎ | match results
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difference_type length( size_type n = 0 ) const;
(since C++11)

Returns the length of the specified sub-match.

If n == 0, the length of the entire matched expression is returned.

If n > 0 && n < size(), the length of nth sub-match is returned.

if n >= size(), a length of the unmatched match is returned.

The call is equivalent to (*this)[n].length().

[edit] Parameters

n - integral number specifying which match to examine

[edit] Return value

The length of the specified match or sub-match.

[edit] See also

returns specified sub-match
(public member function) [edit]
returns the length of the match (if any)
(public member function of std::sub_match) [edit]