title: AWK fast value search
body: <p>I need a fast way to match a value in AWK, I have 250k values to search.</p>
  
  <p>I'm doing something like this:</p>
  
  <pre><code>    #list with 250k numbers instead of four
      number_list="9998532001 9998536052 9998543213 9998544904"
  
      if ( index(number_list,substr($5,9)) ) 
           {printf "Value: %s\n",$5;}
  </code></pre>
  
  <p>Any suggestions for a faster search ?</p>