How to delete files older than 5 days using only regular expression : <p>How to delete files older than 5 days based on current date.</p>

<p>My File names are like that:</p>

<pre><code>2016-01-01 Normal.csv
2016-01-02 Normal.csv
2016-01-03 Normal.csv
2016-01-04 Normal.csv
2016-01-05 Normal.csv
2016-01-06 Normal.csv
2016-01-07 Normal.csv
</code></pre>

<p>Every day one new file in coming into that folder. I want to delete older than 5 days file.</p>
