C# Replace with Callback Function like in AS3

Question

In AS3 you have a function on a string with this signature:

function replace(pattern:*, repl:Object):String 

The repl:Object can also specify a function. If you specify a function, the string returned by the function is inserted in place of the matching content.

Also, is it possible to get the the original string in which I want to replace things?

(In AS3 you can get the original string by

var input:String = arguments[2]; //in the callback function

)

I don't see a property in the Match class containing the original string...

Answer 1

static void Main() {

    string s1 = Regex.Replace("abcdefghik", "e",
        match => "*I'm a callback*");

    string s2 = Regex.Replace("abcdefghik", "c", Callback);
}
static string Callback(Match match) {
    return "*and so am i*";
}

Note you have access to the matched data via the argument (and match.Value in particular, unless you want access to the regex groups (.Groups) etc).