std::regex_error

 

C++

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Feature test macros (C++20)

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Ranges library (C++20)

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Filesystem library (C++17)

Regular expressions library (C++11)

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Technical specifications

Symbols index

External libraries

 

Regular expressions library

Classes

basic_regex (C++11)

sub_match (C++11)

match_results (C++11)

Algorithms

regex_match (C++11)

regex_search (C++11)

regex_replace (C++11)

Iterators

regex_iterator (C++11)

regex_token_iterator (C++11)

Exceptions

regex_error (C++11)

Traits

regex_traits (C++11)

Constants

syntax_option_type (C++11)

match_flag_type (C++11)

error_type (C++11)

Regex Grammar

Modified ECMAScript-262 (C++11)

 

std::regex_error

Member functions

regex_error::regex_error

regex_error::operator=

regex_error::code

 

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)
operator=	replaces the regex_error object (public member function)
code	gets the std::regex_constants::error_type for a regex_error (public member function)

Inherited from std::runtime_error

Inherited from std::exception

Member functions

(destructor) [virtual]	destroys 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 <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