title: Using Regular Expressions with Shell Scripting
body: <p>I have been learning about shell scripting and regular expressions.
  I want to find a way to extract a specific part from the file name below.</p>
  
  <pre><code> profiles_060315091024_30398-r-00006.avro 
  </code></pre>
  
  <p>I want to extract the number 30398 from the file name. </p>
  
  <p>Thanks</p>