Test Password Strength

$('#pass').keyup(function(e) {
     var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\W).*$", "g");
     var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");
     var enoughRegex = new RegExp("(?=.{6,}).*", "g");
     if (false == enoughRegex.test($(this).val())) {
             $('#passstrength').html('More Characters');
     } else if (strongRegex.test($(this).val())) {
             $('#passstrength').className = 'ok';
             $('#passstrength').html('Strong!');
     } else if (mediumRegex.test($(this).val())) {
             $('#passstrength').className = 'alert';
             $('#passstrength').html('Medium!');
     } else {
             $('#passstrength').className = 'error';
             $('#passstrength').html('Weak!');
     }
     return true;
});

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Password Strength Example</title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#pass').keyup(function (e) {
                var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\W).*$", "g");
                var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");
                var enoughRegex = new RegExp("(?=.{6,}).*", "g");
                if (false == enoughRegex.test($(this).val())) {
                    $('#passstrength').html('More Characters');
                } else if (strongRegex.test($(this).val())) {
                    $('#passstrength').className = 'ok';
                    $('#passstrength').html('Strong!');
                } else if (mediumRegex.test($(this).val())) {
                    $('#passstrength').className = 'alert';
                    $('#passstrength').html('Medium!');
                } else {
                    $('#passstrength').className = 'error';
                    $('#passstrength').html('Weak!');
                }
                return true;
            });
        });
    </script>
</head>
<body>
    <form name="Login" method="post" action="">
        <fieldset>
            <legend>Password Strength</legend>
            <input type="password" name="pass" id="pass">
            <span id="passstrength"></span>
        </fieldset>
    </form>
</body>
</html>

See JSFiddle: JSFiddle

Resource: CSS-Tricks.com

Originally Posted on February 2, 2015
Last Updated on October 26, 2015

All information on this site is shared with the intention to help. Before any source code or program is ran on a production (non-development) system it is suggested you test it and fully understand what it is doing not just what it appears it is doing. I accept no responsibility for any damage you may do with this code.

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