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Auto-Appending Query String to URL's on Condition

EMB01
EMB01 asked
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Last Modified: 2013-12-13
How do I append a querystring to a URL when the URL is inside a bunch of HTML? Furthermore, how do I append upon two conditions; one, if the URL doesn't contain a "?" and, two, if the URL does contain a "?"

Example attached.
<HTML>
<p>The following link should change to "http://www.emarketbuilders.com/?var=val."</p>
<a href="http://www.emarketbuilders.com">Link without original querystring</a>
<br />
<p>The following link should change to "http://www.emarketbuilders.com/?var=val&var1=val1."</p>
<a href="http://www.emarketbuilders.com/?var1=val1">Link with original querystring</a>
<br />
<p>So, there should be two separate variables two append for two different conditions. The questions are: </p>
<ul>
<li>How do I find URL's from a variable containing HTML (like this one).</li>
<li>How do I replace the URL's based on the result?</li>
</ul>
<p>Thank you!</p>
</HTML>

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