ios 正则表达式

NSString *taskTitleStyle = @"font-weight: bold; color: rgb(238, 236, 224); ";

NSError *error = NULL;
    NSString *substringForFirstMatch;
   
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\b(\\d)*\\,\\s(\\d)*\\,\\s(\\d)*\\b"
                                                                           options:NSRegularExpressionCaseInsensitive
                                                                             error:&error];
   
    NSRange rangeOfFirstMatch = [regex rangeOfFirstMatchInString:taskTitleStyle options:0 range:NSMakeRange(0, [taskTitleStyle length])];
   
    if (!NSEqualRanges(rangeOfFirstMatch, NSMakeRange(NSNotFound, 0))) {
        substringForFirstMatch = [taskTitleStyle substringWithRange:rangeOfFirstMatch];
        NSLog(@"%@", substringForFirstMatch);//打印238, 236, 224
    }
   
    NSArray *array = [substringForFirstMatch componentsSeparatedByString:@", "];
   
    return [UIColor colorWithRed:[[array objectAtIndex:0] floatValue] / 255 green:[[array objectAtIndex:1] floatValue] / 255 blue:[[array objectAtIndex:2] floatValue] / 255 alpha:1];