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Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex/../match_results/length.html below:

std::match_results<BidirIt,Alloc>::length - cppreference.com

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().

ready() must be true. Otherwise, the behavior is undefined.

[edit] Parameters n - integral number specifying which match to examine [edit] Return value

The length of the specified match or sub-match.

[edit] Example [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<BidirIt>) [edit]

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