Validate Email address in iOS

Email address Validation 

- (BOOL)validateEmailWithString:(NSString*)checkString

{

    BOOL stricterFilter = NO;

    NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";

    NSString *laxString = @".+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";

    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;

    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

    return [emailTest evaluateWithObject:checkString];

}