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This is the input string 23x * y34x2 . I want to insert " * " (star surrounded by whitespaces) after every number followed by letter, and after every letter followed by number. So my output string would look like this: 23 * x * y * 34 * x * 2 . This is the regex that does the job: @"\d(?=[a-z])|[a-z](?=\d)" . This is the function that I wrote that inserts the " * " . Regex reg = new Regex(@"\d(?=[a-z])|[a-z](?=\d)"); MatchCollection matchC; matchC = reg.Matches(input); int ii = 1; foreach (Match element in matchC)//foreach match I will find the index of that match { input = input.Insert(element.Index + ii, " * ");//since I' am inserting " * " ( 3 characters ) ii += 3; //I must increment index by 3 } return input; //return modified input My question how to do same job using .net MatchEvaluator ? I am new to regex and don't understand good replacing with MatchEvaluator . This is the code that I tried to wrote: { Regex reg = new Regex(@"\d(?=[a-z])|[a-z](?=\d)"); MatchEvaluator matchEval = new MatchEvaluator(ReplaceStar); input = reg.Replace(input, matchEval); return input; } public string ReplaceStar( Match match ) { //return What?? }

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