Fórum ➡ Finding STRONG tags that contain UL tags, using Regex class♦, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

// aljodav
// http://rextester.com/users/376

// in reply to the thread
// https://social.msdn.microsoft.com/Forums/WindowsServer/en-us/ecf63c6b-cbb0-4f3c-8025-2c525082c486/regular-expression-question-what-is-the-regular-expression-for-my-search?forum=csharpgeneral

namespace Rextester
{
 public class Program
 {
 public static void Main(string[] args)
 {
 // SINGLE LINE STRINGS ONLY!
 string test="red green blue cyan <ul><li>Sun</li><li>Mercury</li></ul> magenta yellow orange <ul><li>Venus</li><li>Earth</li></ul>";
 string patt1="<strong.+?/strong>";
 string patt2="<ul.+?/ul>";
 
 // NOTICE ➡ it is QUITE SIMPLE!
 
 foreach(Match m in Regex.Matches(test,patt1)){
 
 Console.WriteLine(
 Regex.Match(m.Value,patt2).Success?m.Value:""
 );
 
 }
 
 Console.WriteLine("\n\nHello, world! :P");
 }
 }
}

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Compilation time: 0,17 sec, absolute running time: 0,18 sec, cpu time: 0,19 sec, average memory usage: 18 Mb, average nr of threads: 4