title: AWK to search for a for a string and print full text where string occurs
body: <p>I have a document containing several lines of text.</p>
  
  <p><strong>Example(not actual):</strong></p>
  
  <blockquote>
    <p>*Prepare 42 Locked  delete from table where type='test' and user_id='099'and number='+66719919*</p>
  </blockquote>
  
  <p>I want to be able to search for user_id where ever it occurs in the document (which does not follow a pattern) and have the output as:</p>
  
  <blockquote>
    <p>user_id=009</p>
  </blockquote>
  
  <p>OR</p>
  
  <blockquote>
    <p>009</p>
  </blockquote>
  
  <p>Please how do I achieve this using awk?</p>
  
  <p>Thanks.</p>