std::match_results<BidirIt,Alloc>::length (3) - Linux Manuals

std::match_results<BidirIt,Alloc>::length: std::match_results<BidirIt,Alloc>::length


std::match_results<BidirIt,Alloc>::length - std::match_results<BidirIt,Alloc>::length


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

Return value

The length of the specified match or sub-match.

See also

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