Question

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

Let’s say I have the string:

string s = "Hello world.";

how can I replace the first o in the word Hello for let’s say Foo?

In other words I want to end up with:

"HellFoo world."

I know how to replace all the o’s but I want to replace just the first one

Answer 1

I think you can use the overload of Regex.Replace to specify the maximum number of times to replace…

var regex = new Regex(Regex.Escape("o"));
var newText = regex.Replace("Hello World", "Foo", 1);