std::regex_constants::error_type
| Defined in header  <regex> | ||
| typedef /*implementation defined*/ error_type; | (since C++11) | |
| constexpr error_type error_collate = /*unspecified*/; constexpr error_type error_ctype = /*unspecified*/; | (since C++11) | |
The error_type is a type that describes errors that may occur during regular expression parsing.
[edit] 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 | 
[edit] Notes
In C++11, these constants were specified with redundant keyword static, which was removed by C++14 via LWG issue 2053
[edit] See also
| (C++11) | reports errors generated by the regular expressions library (class) | 


