using System;
using System.Text.RegularExpressions;
class Program
{
static void Main()
{
string str = "This is my website check it out https://www.collectivesolver.com";
Regex r = new Regex(@"(https?://[^\s]+)");
str = r.Replace(str, "<a href=\"$1\">$1</a>");
Console.WriteLine(str);
}
}
/*
run:
This is my website check it out <a href="https://www.collectivesolver.com">https://www.collectivesolver.com</a>
*/