title: How to count the number of keys matching a pattern?
body: <p>How can I find the count of all the keys that has a matching pattern.</p>
  
  <p>For example, there are two keys <code>abc:random-text-1</code> and <code>abc:random-text-2</code> . The common pattern here is<code>abc:</code> . So, here the count is 2.</p>
  
  <p>How can I do this in redis?</p>