std::regex_constants::error_type

 

C++

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Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

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)

 

Defined in header <regex>
typedef /*implementation defined*/ error_type;		(since C++11)
constexpr error_type error_collate = /*unspecified*/; constexpr error_type error_ctype = /*unspecified*/; constexpr error_type error_escape = /*unspecified*/; constexpr error_type error_backref = /*unspecified*/; constexpr error_type error_brack = /*unspecified*/; constexpr error_type error_paren = /*unspecified*/; constexpr error_type error_brace = /*unspecified*/; constexpr error_type error_badbrace = /*unspecified*/; constexpr error_type error_range = /*unspecified*/; constexpr error_type error_space = /*unspecified*/; constexpr error_type error_badrepeat = /*unspecified*/; constexpr error_type error_complexity = /*unspecified*/; constexpr error_type error_stack = /*unspecified*/;		(since C++11) (until C++17)
inline constexpr error_type error_collate = /*unspecified*/; inline constexpr error_type error_ctype = /*unspecified*/; inline constexpr error_type error_escape = /*unspecified*/; inline constexpr error_type error_backref = /*unspecified*/; inline constexpr error_type error_brack = /*unspecified*/; inline constexpr error_type error_paren = /*unspecified*/; inline constexpr error_type error_brace = /*unspecified*/; inline constexpr error_type error_badbrace = /*unspecified*/; inline constexpr error_type error_range = /*unspecified*/; inline constexpr error_type error_space = /*unspecified*/; inline constexpr error_type error_badrepeat = /*unspecified*/; inline constexpr error_type error_complexity = /*unspecified*/; inline constexpr error_type error_stack = /*unspecified*/;		(since C++17)

The error_type is a type that describes errors that may occur during regular expression parsing.

Constants

Constant	Explanation
error_collate	the expression contains an invalid collating element name
error_ctype	the expression contains an invalid character class name
error_escape	the expression contains an invalid escaped character or a trailing escape
error_backref	the expression contains an invalid back reference
error_brack	the expression contains mismatched square brackets ('[' and ']')
error_paren	the expression contains mismatched parentheses ('(' and ')')
error_brace	the expression contains mismatched curly braces ('{' and '}')
error_badbrace	the expression contains an invalid range in a {} expression
error_range	the expression contains an invalid character range (e.g. [b-a])
error_space	there was not enough memory to convert the expression into a finite state machine
error_badrepeat	one of *?+{ was not preceded by a valid regular expression
error_complexity	the complexity of an attempted match exceeded a predefined level
error_stack	there was not enough memory to perform a match

Notes

In C++11, these constants were specified with redundant keyword static, which was removed by C++14 via LWG issue 2053

See also

regex_error (C++11)

reports errors generated by the regular expressions library (class)