判断返回的字符串里面含有什么字段

NSString*filename = symbolStr;

    NSString *couponidstr = @"couponid=";

    NSString *shopstr = @"shopid=";

    if ([filename rangeOfString:shopstr].length!=0) {

        NSLog(@"fuck-------%d",[filename rangeOfString:shopstr].location);

      NSString *str = [filename substringFromIndex:[filename rangeOfString:shopstr].location+[filename rangeOfString:shopstr].length];

        NSLog(@"loc=%dlen=%d",[filename rangeOfString:shopstr].location, [filename rangeOfString:shopstr].length);

   

    }else 

{

//进行相应的判断

}

这个是判断返回的字段中是否含有@"shopid="这个字段