Evaluate math expression in c# that should handle whitespace if it exists - math

Question

I am trying to use the following code to evaluate math expression. currently, the expression parser only works if there is a whitespace between every character. ex: (x + y) *2.... if the expression is (x+y)*2, the expression does not evaluate. Trying to use regex so the expression evaluates with or without spaces,but still unable to meet the goal. Any direction/help is greatly appreciated.
using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string input = "(x + y)*2";
string pattern = "\\s+";
string replacement = " ";
Regex rgx = new Regex(pattern);
string result = rgx.Replace(input, replacement);
Console.WriteLine("Original String: {0}", input);
Console.WriteLine("Replacement String: {0}", result);
}
}

Answer 1

If extra spaces between the terms is fine, please try this code:
public static void Main()
{
string input = "(x + y)*2";
string pattern = "";
string replacement = " ";
Regex rgx = new Regex(pattern);
string result = rgx.Replace(input, replacement);
Console.WriteLine("Original String: {0}", input);
Console.WriteLine("Replacement String: {0}", result);
}

Answer 2

public static void Main()
{
string input = "(x + y)*2";
string pattern = "";
string replacement = " ";
Regex rgx = new Regex(pattern);
string result = rgx.Replace(input, replacement);
pattern = " ";
replacement = " ";
rgx = new Regex(pattern);
result = rgx.Replace(result, replacement);
Console.WriteLine("Original String: {0}", input);
Console.WriteLine("Replacement String: {0}", result);
}