Form Validation In Liferay -- Client Side validation

In Liferay we can do client side validation very easily.

 We use <aui:validator>  tag to do validations.

It allows "name" and "errormessage" attributes

Names it allows are:

1. alpha
2. alphanum
3. date
4. digits
5. email
6. equalTo
7. number
8. acceptFiles
9. min
10. minLength
11. max
12. maxLength
13. range
14. rangeLength
15. required
16. url
17. custom

Here custom is use to give custom validations ,
Below Exampleis the custom validation for email validation .In Liferay for email sometimes its is not working. So i am writing the custom validation. 

Just Copy & paste the code and try it will perfectly works

<aui:validator name="custom" errorMessage="Please enter valid email address">

      function (val, fieldNode, ruleValue) {
          var result = false;
       var emailRegexStr = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
        var isvalid = emailRegexStr.test(val);
if (isvalid) {
 result = true;
}
 return result;
}
         </aui:validator>