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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<input type="password" name="mypass" id="mypass" />
<span id="checkstrength"></span>
<script type="text/javascript">
$(document).ready(function () {
$('#mypass').keyup(function(e) {
var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\\W).*$", "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())) {
$('#checkstrength').html('More Characters');
} else if (strongRegex.test($(this).val())) {
$('#checkstrength').className = 'ok';
$('#checkstrength').html('Strong!');
} else if (mediumRegex.test($(this).val())) {
$('#checkstrength').className = 'alert';
$('#checkstrength').html('Medium!');
} else {
$('#checkstrength').className = 'error';
$('#checkstrength').html('Weak!');
}
return true;
});
});
</script>
</body>
</html>
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