title: Find particular string in Heroku logs
body: <p>I am logging some errors by doing this in my Rails app:</p>
  
  <pre><code>logger.error "MY ERROR STRING"
  </code></pre>
  
  <p>How can I look in heroku logs to find that line?</p>
  
  <p>I know how to do <code>heroku logs --tail</code> and <code>heroku logs -n 500</code> ,but how can I find a specific string in the logs?</p>