title: How can I count the numbers in a string of mixed text/numbers
body: <p>So what I'm trying to do, is take a job number, which looks like this xxx123432, and count the digits in the entry, but not the letters.  I want to then assign the number of numbers to a variable, and use that variable to provide a check against the job numbers to determine if they are in a valid format.</p>
  
  <p>I've already figured out how to perform the check, but I have no clue how to go about counting the numbers in the job number.</p>
  
  <p>Thanks so much for your help.</p>