using System.Text.RegularExpressions;
using System.Collections.Generic;
public static void Main()
string blacklistHtmlTagsForXSS = @"\<[\s\t\/]*" + string.Join(@"[^>]*\>|\<[\s\t\/]*", new List<string>
var inputString = @"<inlinebutton>test</inlinebutton>((\<inlinebutton\> test2 \</inlinebutton\>))";
var inputString1 = Regex.Replace(inputString, @"((\<inlinebutton\>)([\s\S]*?)(\<\/inlinebutton\>))", "", RegexOptions.IgnoreCase);
Console.WriteLine(inputString1);