title: How to combine characters to create custom pattern in GROK
body: <p>I'm new to logstash and grok and have a question regarding a pattern.</p>
  
  <blockquote>
    <p>Jul 26 09:46:37 </p>
  </blockquote>
  
  <p>The above content contains <code>%{MONTH} %{MONTHDAY} %{TIME}</code> and white spaces.</p>
  
  <p>I need to know how to combine all these and create a pattern <code>%{sample_timestamp}</code></p>
  
  <p>Thanks!</p>