- (NSArray *)matchString:(NSString *)string toRegexString:(NSString *)regexStr
{
    
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regexStr options:NSRegularExpressionCaseInsensitive error:nil];
    
    NSArray * matches = [regex matchesInString:string options:0 range:NSMakeRange(0, [string length])];
    
    //match: 所有匹配到的字符,根据() 包含级
    
    NSMutableArray *array = [NSMutableArray array];
    
    for (NSTextCheckingResult *match in matches) {
        
            //以正则中的(),划分成不同的匹配部分
         NSString *component = [string substringWithRange:[match rangeAtIndex:1]];
            
         [array addObject:component];
    }
    
    return array;
}