jQuery Validate plugin – password check – minimum requirements – Regex

If I add (?=.*[a-z]) the whole code doesn’t work anymore.

Add it here:

/^(?=.*[a-z])[A-Za-z0-9\d=!\-@._*]+$/

However, it’s much easier to do this without a lookahead:

$.validator.addMethod("pwcheck", function(value) {
   return /^[A-Za-z0-9\d=!\-@._*]*$/.test(value) // consists of only these
       && /[a-z]/.test(value) // has a lowercase letter
       && /\d/.test(value) // has a digit
});