C#regex.split方法在括号前添加空字符串

我有一些代码将方程输入标记为字符串数组：

String infix = "( 5 + 2 ) * 3 + 4";
String[] tokens = tokenizer(infix,@"([\+\-\*\(\)\^\\])");
foreach (String s in tokens)
{
   Console.WriteLine(s);
}

现在这里是tokenizer函数：

public String[] tokenizer(String input,String splitExp)
        {
            String NowSpaceInput = Regex.replace(input,@"\s","");
            Console.WriteLine(NowSpaceInput);
            Regex RE = new Regex(splitExp);
            return (RE.Split(NowSpaceInput));
        }

当我运行它时,我将所有字符分开,但在括号chracters之前插入一个空字符串…如何@L_944_9@它？

//这里是空字符串

(

五

 

2

//这里是空字符串

)

*

3

 

4

public String[] tokenizer(String input,String splitExp)
{
    String NowSpaceInput = Regex.replace(input,"");
    Console.WriteLine(NowSpaceInput);
    Regex RE = new Regex(splitExp);
    return (RE.Split(NowSpaceInput)).Where(x => !String.IsNullOrEmpty(X)).ToArray();
}