$.validator.addMethod(‘AZ09_’, function (value) { return /^[a-zA-Z0-9.-_]+$/.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 — javascript jquery regex testing validation 1 Escaping using – should be fine, but you can also try putting it at the […]