title: batch file to search in txt file for string and get the full line off the string
body: <p>i want batch file to search in txt file for string and get full line of it</p>
  
  <p>this is the txt file input</p>
  
  <p>1:how are you</p>
  
  <p>3:im fine</p>
  
  <p>2:yeah   </p>
  
  <pre><code>     for example
       @echo off
       set string=3:
       echo the full line off the string is %fullline%
       pause
  </code></pre>