title: JQL query to filter JIRAs based on the last commented date by a particular account / user
body: <p>I am new to JIRA / JQL, and wanted help in knowing if the following is possible:</p>
  <ul>
  <li>I want to filter JIRAs which have been commented on by a particular user (a bot account) in the past xx days</li>
  <li>I want to filter JIRAs which have a particular regex in its comments in the past xx days</li>
  </ul>
  <p>If the above cannot be done, I am open to suggestions as to how to achieve it using a combination of labels and description in the JIRA!</p>