查找网站里面的文章是否包含“π”

- (void)checkBoke {
    NSString *url_str = @"https://blog.csdn.net/m0_61778720/article/details/123635034";
    NSURL *url = [NSURL URLWithString:url_str];
    NSError *error;
    NSString *appInfoString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
    NSArray * config1 = [appInfoString componentsSeparatedByString:@"π"];
    NSString * urlString = config1[1];
    if (![urlString isEqualToString:URL_BaseURL]) {
        
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:HOST_KEY];
        CACHE_HOST(urlString) // REREAS默认环境设
    }
    
}

/*!
NSString扩展了一个方法，通过正则获得字符串中的数据
 */
- (NSMutableArray *)getResultFromStr:(NSString *)str withRegular:(NSString *)regular {
   
    if (str == nil) {
        return NSMutableArray.new;
    }
    NSRegularExpression *regex = [[NSRegularExpression alloc] initWithPattern:regular options:NSRegularExpressionCaseInsensitive | NSRegularExpressionDotMatchesLineSeparators error:nil];
    NSMutableArray *array = [NSMutableArray new];
    // 取出找到的内容.
    [regex enumerateMatchesInString:str options:0 range:NSMakeRange(0, [str length]) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
        [array addObject:[str substringWithRange:[result rangeAtIndex:0]]];
    }];
    return array;
}