std::match_results::empty

From cppreference.com
bool empty() const;
(since C++11)

Checks whether the match was successful.

Contents

[edit] Parameters

(none)

[edit] Return value

true if the match_results object contains no matches., false otherwise

[edit] Exceptions

(none)

[edit] Complexity

Constant.

[edit] See also

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