# std::match_results<BidirIt,Alloc>::empty

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< cpp‎ | regex‎ | match results

bool empty() const; |  | (since C++11) (until C++20)
[[nodiscard]] bool empty() const; |  | (since C++20)

Checks whether the match was successful.

### Parameters

(none)

### Return value

true if *this represents the result of a failed match, false otherwise, i.e. size() == 0.

### Exceptions

May throw implementation-defined exceptions.

### Complexity

Constant.

### See also

size | returns the number of matches in a fully-established result state (public member function)

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