How to substitute place holders in a string with values

Question

Given the string

string command = "%ans[1]%*100/%ans[0]%"

Will replace to %ans[1]% to array[1] %ans[0]% to array[2]

How do I substitute the place holders in command with the values in the array to get the following result? Should I use Regular Expressions for this?

And using Regex.Replace ?

"test2*100/test1"

Answer 1

You could just use string.Format to insert your string into the command string:

string command = "{0}*100/{1}";

string[] array = new string[] { "test1", "test2" };

string.Format(command, array[1], array[0]);

Answer 2

You could try using a standard Replace.

Something like

string command = "%ans[1]%*100/%ans[0]%";
string[] array = new string[] { "test1", "test2" };
for (int iReplace = 0; iReplace < array.Length; iReplace++)
    command = command.Replace(String.Format("%ans[{0}]%", iReplace), array[iReplace]);

Answer 3

This does it, but I doubt it's what your looking for. Oh well.

for (int i = 0; i < array.Length; i++)
{
    command = command.Replace(string.Format("%ans[{0}]%", i), array[i]);
}