Objective c 如何在对象c中按regx过滤字符串

假设有一个字符串

NSString *str = @"https://www.xxx.com?t=aaa&m=bbb&s=92,"

现在我想得到t，m，s的值，如下所示：

aaa,bbb,92

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谁能告诉我如何在对象c中实现它呢？

简单的方法就是

NSString *str = @"https://www.xxx.com?t=aaa&m=bbb&s=92,";

NSArray * list = [str componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"?=&,"]];


//Test result    
for (int i = 1; (i+1)<[list count];i = i +2)
{
    NSLog(@"%@ = %@",[list objectAtIndex:i],[list objectAtIndex:(i+1)]);
}

试着这样做：-

    NSString *str1 = @"https://www.xxx.com?t=aaa&m=bbb&s=92,";
    NSMutableArray *arr1=[[str1 componentsSeparatedByString:@"="]mutableCopy];
    [arr1 removeObjectAtIndex:0];
    NSMutableArray *mutArray=[NSMutableArray array];
    for (NSString *str1 in arr1)
    {
        ([str1 length] >3)? [mutArray addObject:[str1 substringToIndex:3]] : [mutArray addObject:[str1 substringToIndex:2]];
    }
    NSLog(@"%@",[mutArray componentsJoinedByString:@","]);

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这不是关于Objective-C的问题。