gist:3bea53c05336f931bd1d

- (BOOL)isValidEmailAddress:(NSString *)text {
    NSError *error = NULL;
    NSRange textRange = {0, [text length]};
    NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];
    if (!detector) {
        NSLog(@"Could not instantiate link detector for email validation: %@", error);
        return NO;
    }
    
    NSTextCheckingResult *result = [detector firstMatchInString:text options:0 range:textRange];