title: Cant receive value from reg expression extractor at Jmeter
body: <p>I created a test plan with two requests. In the first request I receive a JSON response from which I select an auth token. In the second request I should reach a page with this token, but instead I get: <code>Authorization: Bearer ${token}''</code></p>
  
  <p>First response:</p>
  
  <pre><code>{"message":"Success","authentication_token":"UG5FzqsXNb9jnvG8dzbo","token_type":"Bearer","refresh_token":"","user_id":1,"first_name":"John","last_name":"Doe"}
  </code></pre>
  
  <p>Regular expression:</p>
  
  <pre><code>"authentication_token":"(.+?)"
  </code></pre>
  
  <p>The regular expression seems to be OK. I tested it with the View Results Tree. I still have <code>Authorization: Bearer ${token}''</code> in the second request.</p>