title: JMeter Regular Expression to extract number
body: <p>I want to extract letters-number from response data and tried few regex but none are working. </p>
  
  <p>E.g. the response data (json) will contain something like:</p>
  
  <pre><code>"sessionId":"WC-123"
  </code></pre>
  
  <p>And I want to extract value of sessionId i.e. <code>WC-123</code> and store it in variable so that it can be used in other tests.</p>
  
  <p>The format of sessionId will not change. It's <code>WC-(Number)</code>.</p>