Accounting for lower and uppercase in glob
<p>I need to pass an extension to function, and then have that function pull all files with that extension in both lower and uppercase form.</p>

<p>For example, if I passed <code>mov</code>, I need to function to do:</p>

<pre><code>videos = [file for file in glob.glob(os.path.join(dir, '*.[mM][oO][vV]'))] 
</code></pre>

<p>How would I accomplish the lower + upper combination above given a lowercase input?</p>
