NSPredicateを使って正規表現的なあれができるよ。 NSPredicate *regex = [NSPredicate predicateWithFormat:@"SELF matches %@", @"[hoge|fuga]+"]; NSString *s1 = @"hoge"; NSLog(@"%d", [regex evaluateWithObject:s1]); //=> YES NSString *s2 = @"fuga"; NSLog(@"%d", [regex evaluateWithObject:s2]); //=> YES NSString *s3 = @"hogefuga"; NSLog(@"%d", [regex evaluateWithObject:s3]); //=> YES NSString *s4 = @"hogefugamoge"; NSLog(@"