# std::regex_error

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< cpp‎ | regex

Defined in header `<regex>` |  |
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

(constructor) | constructs a `regex_error` object (public member function)
code | gets the std::regex_constants::error_type for a `regex_error` (public member function)

## Inherited from std::exception

### Member functions

(destructor) [virtual] | destructs the exception object (virtual public member function of `std::exception`)
what [virtual] | returns an explanatory string (virtual public member function of `std::exception`)

### Example

Run this code

    #include <regex>
    #include <iostream>

    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";
            }
        }
    }

Output:

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

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