std::regex_error - cppreference.com

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`class regex_error;`		(since C++11)

Defines the type of exception object thrown to report errors in the regular expressions library.

Inheritance diagram

Member functions

	constructs a `regex_error` object (public member function) [edit]
	replaces the `regex_error` object (public member function) [edit]
	gets the std::regex_constants::error_type for a `regex_error` (public member function) [edit]

Inherited from std::exception

Member functions

	destroys the exception object (virtual public member function of `std::exception`) [edit]
	returns an explanatory string (virtual public member function of `std::exception`) [edit]

Example

#include <iostream>
#include <regex>

int main()
{
    try
    {
        std::regex re("[a-b][a");
    }
    catch (const std::regex_error& e)
    {
        std::cout << "regex_error caught: " << e.what() << '\n';
        if (e.code() == std::regex_constants::error_brack)
            std::cout << "The code was error_brack\n";
    }
}

Possible output:

regex_error caught: The expression contained mismatched [ and ].
The code was error_brack