Email validation in iphone

- (BOOL) isValidEmail:(NSString *) email {

errorMessage = [NSMutableString stringWithString: @""];

BOOL validEmail = YES;

NSString *emailRegex = @"[a-zA-Z0-9.\\-_]{2,32}@[a-zA-Z0-9.\\-_]{2,32}\[A-Za-z]{2,4}";

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

validEmail = [regExPredicate evaluateWithObject:email];

if (!validEmail) {

errorMessage = [NSMutableString stringWithString:@"Invalid Email"];

        validEmail = NO;

        NSLog(@"Invalid Email");

}

if ([email length] > 30) {

errorMessage = [NSMutableString stringWithString:@"Very Long Email"];

validEmail = NO;

        NSLog(@"Very Long Email");

}

if ([email length] == ZERO_LENGTH) {

errorMessage = [NSMutableString stringWithString:@"Please type valid email id"];

validEmail = NO;

        NSLog(@"Please type valid email id");

}

return validEmail;

}