title: regex - get numbers after certain character string
body: <p>I have a text string that can be any number of characters that I would like to attach an order number to the end. Then I can pluck off the order number when I need to use it again. Since there's a possibility that the number is variable length, I would like to do a regular expression that catch's everything after the <code>=</code> sign in the string <code>?order_num=</code></p>
  
  <p>So the whole string would be</p>
  
  <pre><code>"aijfoi aodsifj adofija afdoiajd?order_num=3216545"
  </code></pre>
  
  <p>I've tried to use the online regular expression generator but with no luck. Can someone please help me with extracting the number on the end and putting them into a variable and something to put what comes before the <code>?order_num=203823</code> into its own variable.</p>
  
  <p>I'll post some attempts of my own, but I foresee failure and confusion. </p>