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

string_type str( size_type n = 0 ) const;

(since C++11)

Returns a string representing the indicated sub-match.

If n == 0, a string representing entire matched expression is returned.

If 0 < n && n < size(), a string representing n^th sub-match is returned.

if n >= size(), a string representing the unmatched match is returned.

The call is equivalent to string_type((*this)[n]);

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

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

Returns a string representing the specified match or sub match.

[edit] Example

Output:

entire match: aaab
submatch #1: a
entire match: aaab
submatch #1: aa

[edit] See also

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