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$.validator.addMethod('AZ09_', function (value) { return /^[a-zA-Z0-9.-_]+$/.test(value); }, 'Only letters, numbers, and _-. are allowed'); When I use somehting like test-123 it still triggers as if the hyphen is invalid. I tried \- and --
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In regular expressions, the hyphen ("-") notation has special meaning; it indicates a range that would match any number from 0 to 9. As a result, you must escape the "-" character with a forward slash ("\") when matching the literal hyphens in a social security number.
You only need to escape the dash character if it could otherwise be interpreted as a range indicator (which can be the case inside a character class).
By placing part of a regular expression inside round brackets or parentheses, you can group that part of the regular expression together. This allows you to apply a quantifier to the entire group or to restrict alternation to part of the regex. Only parentheses can be used for grouping.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
Escaping using \- should be fine, but you can also try putting it at the beginning or the end of the character class. This should work for you:
/^[a-zA-Z0-9._-]+$/ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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