title: PHP Using RegEx to get substring of a string
body: <p>I'm looking for an way to parse a substring using PHP, and have come across preg_match however I can't seem to work out the rule that I need. </p>
  
  <p>I am parsing a web page and need to grab a numeric value from the string, the string is like this</p>
  
  <pre><code>producturl.php?id=736375493?=tm
  </code></pre>
  
  <p>I need to be able to obtain this part of the string:</p>
  
  <p>736375493</p>
  
  <p>Thanks Aaron</p>