28 Text processing library [text]

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; }

The type error_type is an implementation-defined enumerated type ([enumerated.types]).

Values of type error_type represent the error conditions described in Table 120:

Table 120 — 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.