【objective-c】正規表現

        NSString* targetStr = @"19801231";
        NSString* regexpStr = @"([0-9]{4})([0-9]{2})([0-9]{2})";
        NSError* error   = nil;
        NSRegularExpression *regexp = [NSRegularExpression regularExpressionWithPattern:regexpStr options:0 error:&error];
        if (error != nil) {
            NSLog(@"%@", error);
        } else {
            NSTextCheckingResult *match = [regexp firstMatchInString:targetStr options:0 range:NSMakeRange(0, targetStr.length)];
            NSLog(@"ヒット数 %d", match.numberOfRanges);
            NSLog(@"全体 %@", [targetStr substringWithRange:[match rangeAtIndex:0]]);
            NSLog(@"1個目の部分文字列　%@", [targetStr substringWithRange:[match rangeAtIndex:1]]);
            NSLog(@"2個目の部分文字列　%@", [targetStr substringWithRange:[match rangeAtIndex:2]]);
        }