title: Return true or false on SAS pattern match
body: <p>Is it possible inside of a SAS macro to return true or false on matching a pattern. </p>
  
  <p>I have a field where some rows will contain a string like</p>
  
  <p><code>word_1234_abc123</code></p>
  
  <p>Where word won't change, 1234 can be any number, and abc123 can be any three letters followed by any three numbers.</p>
  
  <p>Is it possible to return true if a string matches that pattern?</p>
  
  <p>I was looking at rxparse but that doesn't seem to do this.</p>