title: is there any way to vimgrep, limiting to >1 but not all types of files?
body: <p>i'm pretty used to doing either:</p>
  
  <pre><code>:vimgrep /whatever/ **/*
  </code></pre>
  
  <p>or</p>
  
  <pre><code>:vimgrep /whatever/ **/*.txt
  </code></pre>
  
  <p>but is there a way with vim globbing to do, say, 2 file types? i guess i want something that would work kind of like this:</p>
  
  <pre><code>:vimgrep /whatever/ \*\*/.(txt|vb)
  </code></pre>