Check for number of files starting with some string
<p>I want to check in my SD card root for files starting with "thisfile" and return the number of files in an int or a string. </p>

<p>For example i have 10 files on my SD card with the following names:</p>

<pre><code>thisfile1.txt
thisfile444.txt
thisfileffvdfv.txt
thisfilefdfvdfv.txt
thisfile4fvdfv.txt
thisfilefvdfvdf.txt
thisfiledfvdfvdfv.txt
thisfilefdvdfvdf.txt
thisfilewedwed.txt
thisfilewedwedfff.txt
</code></pre>

<p>For this example, I want my code to return 10 for this. </p>

<p>Can somebody help ?</p>
