How to validate e-mail?

A simple regex that can be used to validate e-mail address - ^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$. This can be readily used with client side JavaScript. Following is an example:

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1. function validateEmail(email) {  
2.  return (email.match(/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$/ig) != null) ? true : false;  
3. }  

function validateEmail(email) {
 return (email.match(/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$/ig) != null) ? true : false;
}

javax.mail.internet.InternetAddress can also be used to validate e-mail address. Following is an example:

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1. try {  
2.  InteretAddress address = new InternetAddress(emailstring);  
3.  address.validate();  
4.  return true;  
5. }  
6. catch(AddressException e) {  
7.  return false;  
8. }  

try {
 InteretAddress address = new InternetAddress(emailstring);
 address.validate();
 return true;
}
catch(AddressException e) {
 return false;
}