What regex syntax is this, and how do I make it run on .NET? : <p>I'm looking for a suitable regex for hyperlinks. </p>

<p>I found a link to this website: <a href="https://mathiasbynens.be/demo/url-regex" rel="nofollow">https://mathiasbynens.be/demo/url-regex</a>, which has several choices. (There are too many to list here.)</p>

<p>However, these do not seem to be compatible with .NET's Regex syntax. I tried using the "cowboy" pattern vs several hyperlinks, e.g. <a href="http://www.cnn.com" rel="nofollow">http://www.cnn.com</a>, but no match results. </p>

<p>What syntax are these, and how do I get these to work with .NET? If these require manual tweaking, then just showing how to get the "cowboy" pattern to run will suffice.</p>
