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().
| n | - | integral number specifying which match to examine |
The length of the specified match or sub-match.
| returns specified sub-match (public member function) |
|
| returns the length of the match (if any) (public member function of std::sub_match) |
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