Check if a URL in anchor tag exists on a page on remote URL
<p>My project requires a free user to put a URL to project site on their website to get SEO and back links for project site. So I want to check if  </p>

<p><code>&lt;a href='http://examplesite.com'&gt;example site&lt;/a&gt;</code></p>

<p>exists on page specified by URL given by registering user.
I would have to use this check multiple times so want a less  resource hungry solution.</p>
