I need a regular expression with condition:
Currently I have pattern: (?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{6,50})$
However it doesn't allow special characters, does anybody have a good regex for that?
Thanks
a minimum of 1 special character: ~`! @#$%^&*()-_+={}[]|\;:"<>,./? at least 1 upper case, numeric, and special character must be EMBEDDED somewhere in the middle of the password, and not just be the first or the last character of the password string.
?= is a positive lookahead, a type of zero-width assertion. What it's saying is that the captured match must be followed by whatever is within the parentheses but that part isn't captured. Your example means the match needs to be followed by zero or more characters and then a digit (but again that part isn't captured).
Perhaps a single regex could be used, but that makes it hard to give the user feedback for which rule they aren't following. A more traditional approach like this gives you feedback that you can use in the UI to tell the user what pwd rule is not being met:
function checkPwd(str) { if (str.length < 6) { return("too_short"); } else if (str.length > 50) { return("too_long"); } else if (str.search(/\d/) == -1) { return("no_num"); } else if (str.search(/[a-zA-Z]/) == -1) { return("no_letter"); } else if (str.search(/[^a-zA-Z0-9\!\@\#\$\%\^\&\*\(\)\_\+]/) != -1) { return("bad_char"); } return("ok"); }
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