title: How to use Parameter field in a record selection "like" statement?
body: <p>I have designed a report to pull data fields based on a record selection formula that uses a "like" operator that looks for a substring match in a particular field's data, as so:</p>
  
  <pre><code>{rct.serno} like "*9842*"
  </code></pre>
  
  <p>(due to the free-format way data is stored in the given field, I have to do a substring match to find the relevant rows in the DB.)</p>
  
  <p>This works fine. Instead of manually editing the record selection formula every time, though, I thought to use a Parameter field ("{?TagNum}") to prompt the user for the desired string, and then use that in the record selection formula like:</p>
  
  <pre><code>{rct.serno} like "*{?TagNum}*"
  </code></pre>
  
  <p>Crystal does not throw an error when I save this record selection formula, but it does not return any records after the report is refreshed, and a parameter value is entered. How can I properly use the parameter value in a record selection substring match?</p>