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Showing content from https://en.cppreference.com/w/cpp/algorithm/../regex/match_results/operator_at.html below:

std::match_results<BidirIt,Alloc>::operator[] - cppreference.com

const_reference operator[]( size_type n ) const;

If n > 0 and n < size(), returns a reference to the std::sub_match representing the part of the target sequence that was matched by the n^th captured marked subexpression).

If n == 0, returns a reference to the std::sub_match representing the part of the target sequence matched by the entire matched regular expression.

if n >= size(), returns a reference to a std::sub_match representing an unmatched sub-expression (an empty subrange of the target sequence).

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

Reference to the std::sub_match representing the specified matched subrange within the target sequence.

Output:

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

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