title: parse dynamic function form string
body: <p>I'm trying to parse a dynamic function from a string, for example:</p>
  
  <pre><code>char* func = "app.exe /path:\"@FileExists('filepath', @FileDelete('filepath'), @MsgBox('file not found','error',1))\";
  </code></pre>
  
  <p>I want to parse </p>
  
  <pre><code>@FileExists('filepath', @FileDelete('filepath'), @MsgBox('file not found','error',1))
  </code></pre>
  
  <p>How can I do this?</p>