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regex_error in C++
The regex library has different methods and features related to regular expressions. Here we will see some regex_errors. These are also present at regex library. During executing some regular expressions, we get some errors. That errors are mentioned here.
| Flags | Errors |
|---|---|
| error_collate | In the Regex, the names having invalid collation. |
| error_ctype | In the Regex, there is an invalid character class name. |
| error_stack | Not enough memory to determine regex can be matched or not. |
| error_space | Convert into Finite State Machine, when memory is insufficient |
| error_badrepeat | The string has repeat specifier ( *?+{) that was not preceded by a valid regular expression. |
| error_complexity | The complexity of an attempted match against a regex exceeded a pre-set level |
| error_range | Containing invalid character range. |
| error_badbrace | The regex contains mismatched braces { and }. |
| error_brace | The regex contains invalid range between braces { and }. |
| error_paren | The regex contains mismatched parentheses ( and ). |
| error_brack | The regex contains mismatched brackets ([ and ]). |
| error_backref | The regex excepts invalid back reference. |
| error_escape | The regex does not allows any invalid escaped character, or a trailing escape. |
Example
#include <iostream>
#include <regex>
int main() {
try {
std::regex re("[A-Z][0"); //an error is present
} catch (const std::regex_error& err) {
std::cout << "There is an error. The error is: " << err.what() << '\n';
if (err.code() == std::regex_constants::error_brack) {
std::cout << "This is the code of error_brack\n";
}
}
}Output
There is an error. The error is: Unexpected character in bracket expression. This is the code of error_brack
Updated on: 30-Jul-2019
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