C#检查字符串中的URL

using System;

class Demo {
   static void Main() {
      string input = https://example.com/new.html;

      // See if input matches one of these starts.
      if (input.StartsWith(https://www.example.com) ||
      input.StartsWith(https://example.com)) {
         Console.WriteLine(true);
      }
   }
}