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

operator==,!=(std::match_results) - cppreference.com

template< class BidirIt, class Alloc > bool operator==( match_results<BidirIt,Alloc>& lhs, match_results<BidirIt,Alloc>& rhs ); (1) (since C++11) template< class BidirIt, class Alloc > bool operator!=( match_results<BidirIt,Alloc>& lhs, match_results<BidirIt,Alloc>& rhs ); (2) (since C++11)
(until C++20)

Compares two match_results objects.

Two match_results are equal if the following conditions are met:

neither of the objects is ready, or
both match results are ready and the following conditions are met:

lhs.empty() and rhs.empty(), or
!lhs.empty() and !rhs.empty() and the following conditions are met:

lhs.prefix() == rhs.prefix()
lhs.size() == rhs.size() && std::equal(lhs.begin(), lhs.end(), rhs.begin())
lhs.suffix() == rhs.suffix()

1) Checks if lhs and rhs are equal.

2) Checks if lhs and rhs are not equal.

The != operator is synthesized from operator==.

(since C++20) [edit] Parameters [edit] Return value

1) true if lhs and rhs are equal, false otherwise.

2) true if lhs and rhs are not equal, false otherwise.

[edit] Exceptions

May throw implementation-defined exceptions.

[edit] Example

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