[Solved] Replacing a substring with given form with another in C#

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Basically: take the pattern (containing 3 groups), replace instr with second group from pattern.

    private string MyReplace(string inStr, string leaveStr)
    {
        string pattern = @"(.*?)(" + leaveStr + ")(.*)";
        string repl = @"*$2*";

        Regex rgx = new Regex(pattern);
        return rgx.Replace(inStr, repl);

    }

    string x = MyReplace(@"\textbf\{atext\}", "atext");
    x = MyReplace(@"\textbf\{1\}", "1");

full string – group zero ($0)

(.*?) – first group ($1)

(atext) – second group ($2)

(.*) – third group ($3)

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solved Replacing a substring with given form with another in C#