title: Findstr /g with token or delim
body: <p>Suppose we have 2 files</p>
  
  <p>First.txt</p>
  
  <pre><code>123
  456
  </code></pre>
  
  <p>And Second.txt</p>
  
  <pre><code>789;123
  123;def
  482;xaq
  </code></pre>
  
  <p>What i need is to find the lines in the second file only containing entries of the first file in first column (token 1, delim ; ).
  This is what i need:</p>
  
  <p>Output.txt</p>
  
  <pre><code>123;def
  </code></pre>
  
  <p>Of course, </p>
  
  <pre><code>findstr /g:first.txt second.txt
  </code></pre>
  
  <p>will output both lines:</p>
  
  <pre><code>789;123
  123;def
  </code></pre>
  
  <p>Any idea how i can mix findstr and for /f to get the needed output?
  Thank you!</p>