title: Logstash grok for special character
body: <p>Following is my log</p>
  
  <pre><code># Time: 2017-11-02T07:41:22.631956Z# User@Host: root[root] @ localhost []  Id:     
  </code></pre>
  
  <p>I am not able to write grok pattern for the word <code>root[root]</code>.
  I want this value as a single column. Example : <code>host = root[root]</code>.</p>
  
  <p>I want <code>[</code> in my value.</p>
  
  <p>How to do this ?</p>