Following example show that how we can validate password with the help of Regular Expression that have these validation:
Must be at least 10 characters
Must contain at least one one lower case letter,
one upper case letter,
one digit and one special character
Valid special characters are – @#$%^&+=
<html>
<head>
<script type="text/javascript">
var reg = /^.*(?=.{10,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).*$/;
function PhoneValidation(phoneNumber)
{
var OK = reg.exec(phoneNumber.value);
if (!OK)
window.alert("phone number isn't valid");
else
window.alert("phone number is valid");
}
</script>
</head>
<body>
<p>Enter your phone number and then press Enter.</p>
<form action="">
<input name="txtPhone" onchange="PhoneValidation(this);">
</form>
</body>
</html>