30 Regular expressions library [re]

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

30.4.4 Implementation-defined error_­type [re.err]

Table 138: error_­type values in the C locale [tab:re.err]
Value
Error condition
error_­collate
The expression contained an invalid collating element name.
error_­ctype
The expression contained an invalid character class name.
error_­escape
The expression contained an invalid escaped character, or a trailing escape.
error_­backref
The expression contained an invalid back reference.
error_­brack
The expression contained mismatched [ and ].
error_­paren
The expression contained mismatched ( and ).
error_­brace
The expression contained mismatched { and }
error_­badbrace
The expression contained an invalid range in a {} expression.
error_­range
The expression contained an invalid character range, such as [b-a] in most encodings.
error_­space
There was insufficient 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 against a regular expression exceeded a pre-set level.
error_­stack
There was insufficient memory to determine whether the regular expression could match the specified character sequence.