How do I replace the *first instance* of a string in .NET?

Question

I want to replace the first occurrence in a given string.

How can I accomplish this in .NET?

Answer 1

using System.Text.RegularExpressions;

RegEx MyRegEx = new RegEx("F");
string result = MyRegex.Replace(InputString, "R", 1);

will find first F in InputString and replace it with R.