Email Check Using Java Regex

String email = "pankaj.singh@yahoo.co.in";

Pattern p = Pattern
.compile("[a-z][a-z_.0-9]*@[a-z0-9]*[.]{0,1}[a-z0-9]{1,3}.[a-z]{2,3}$");

Matcher m = p.matcher(email);

boolean b = m.matches();
if (b == true) {
System.out.println("Valid Email ID");
} else {
System.out.println("InValid Email ID");
}