32 Regular expressions library [re]

32.4 Namespace std​::​regex_constants [re.const]

32.4.4 Implementation-defined error_type [re.err]

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namespace std::regex_constants { using error_type = T3; 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; }
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The type error_type is an implementation-defined enumerated type ([enumerated.types]).
Values of type error_type represent the error conditions described in Table 139:
Table 139: error_type values in the C locale [tab:re.err]
Value
Error condition
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 [ and ].
error_paren
The expression contains mismatched ( and ).
error_brace
The expression contains mismatched { and }
error_badbrace
The expression contains an invalid range in a {} expression.
error_range
The expression contains an invalid character range, such as [b-a] in most encodings.
error_space
There is insufficient memory to convert the expression into a finite state machine.
error_badrepeat
One of *?+{ is not preceded by a valid regular expression.
error_complexity
The complexity of an attempted match against a regular expression exceeds a pre-set level.
error_stack
There is insufficient memory to determine whether the regular expression matches the specified character sequence.