best regular expression for validating email addresses? - What is the

Maybe you're wondering why there's no "official" fool-proof regex to match email addresses. Well, there is an official definition, but it's hardly fool-proof.
The official standard is known as RFC 2822. It describes the syntax that valid email addresses must adhere to. You can (but you shouldn't--read on) implement it with this regular expression:

Java program for regex

import java.util.regex.*;
class regexSample 
public static void main(String args[]) 
//Input the string for validation
String email = "";
//Set the email pattern string
Pattern p = Pattern.compile(" (?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"
            + "@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\]");
//Match the given string with the pattern
Matcher m = p.matcher(email);
//check whether match is found 
boolean matchFound = m.matches();
if (matchFound)
System.out.println("Valid Email Id.");
System.out.println("Invalid Email Id.");


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