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Scraping and DOing Some Math on Result


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I'm trying to scrape a page, and replace a given string with a link to an mp3.  The format of the page is always as such:



I need it to return like this:  this will always be the first number + the second number...while removing the dash.


<td><a href='1.mp3'>1</a></td>
<td><a href='2.mp3'>2</a></td>
<td><a href='3.mp3'>3</a></td>
<td><a href='4.mp3'>4</a></td>

Is there a way to combine the regex (which as many times as I've tried, I can't wrap my around) of the matching of the numbers inside the <td> tags with the explode of the dash and the math into one piece of code? 

Edited by bschultz
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