Email validation in Android

1.  public static boolean isEmailValid(String email)

       {

              boolean isValid = false;

              String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";

              CharSequence inputStr = email;

              Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);

              Matcher matcher = pattern.matcher(inputStr);

              if (matcher.matches())

              {

                     isValid = true;

              }

              return isValid;

       }

2. public boolean checkEmailCorrect(String Email)

       {

              String pttn ="[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+";

              Pattern p = Pattern.compile(pttn);

              Matcher m = p.matcher(Email);

              if(m.matches())

              {

                     return true;

              }

              return false;

       }

3.  public final static boolean isValidEmail(CharSequence target)
{
if (target == null)
{
return false;
}
else
{
return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();
}
}

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