28 Text processing library [text]

28.6 Regular expressions library [re]

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

28.6.4.4 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 115:
Table 115 — error_type values in the C locale [tab:re.err]
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Value
Error condition
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error_collate
The expression contains an invalid collating element name.
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error_ctype
The expression contains an invalid character class name.
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error_escape
The expression contains an invalid escaped character, or a trailing escape.
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error_backref
The expression contains an invalid back reference.
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error_brack
The expression contains mismatched [ and ].
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error_paren
The expression contains mismatched ( and ).
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error_brace
The expression contains mismatched { and }.
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error_badbrace
The expression contains an invalid range in a {} expression.
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error_range
The expression contains an invalid character range, such as [b-a] in most encodings.
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error_space
There is insufficient memory to convert the expression into a finite state machine.
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error_badrepeat
One of *?+{ is not preceded by a valid regular expression.
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error_complexity
The complexity of an attempted match against a regular expression exceeds a pre-set level.
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error_stack
There is insufficient memory to determine whether the regular expression matches the specified character sequence.