title: batch script replace variable string within string
body: <p>How can I remove 
  // remove absolute path string from fullPath string</p>
  
  <pre><code>set abs_p=C:\abspath\
  set rel_p=C:\abspath\foo\boo\bar
  </code></pre>
  
  <p>How can I remove the abs_p from the rel_p?
  I'm not getting the syntax working</p>
  
  <pre><code>set rel_p=%rel_p:abs_p=%
  </code></pre>