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>