I want to replace number in two tag to double with regex in

Question

I am bit confused writing the regex for finding the Text between the two delimiters and replace the text with another text in c#how to replace? pop.txt: 25 Result of my code 2500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 500 6000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 80 my code: string text = File.ReadAllText(pop.txt); try { var matches = Regex.Matches(text pattern); var result = (from Match m in matches select (m.Groups[2].ToString())).ToList (); foreach (var item in result) { var a = Convert.ToDouble(item).ToString(###.00); string s = String.Format({0:0.##} item); //textBox4.Text += a + Environment.NewLine; text = text.Replace(itema); } } catch (Exception ex) { // MessageBox.Show(ex.Message); //return; } File.WriteAllText(resultat.txt text);

ankit srivastava · Answer

Dear mohamed salim I think you are trying to replace the data with in html tags So kindly try this below code private string replaceString =  ; public string Parse( string content) { const string regTagName = @  ]*> ; Regex reg = new Regex(@ ( + regTagName + )|(geekzilla)  RegexOptions.IgnoreCase | RegexOptions.Multiline); // this is what I'd like to replace the match with replaceString =  $1  ; // do the replace content = reg.Replace(content new MatchEvaluator(MatchEval)); return content; } protected string MatchEval(Match match) { if (match.Groups[1].Success) { // the tag return match.ToString(); } if (match.Groups[2].Success) { // the text we're interested in return Regex.Replace(match.ToString() (.+)  replaceString); } // everything else return match.ToString(); } All the best