title: How to search in redis for hash keys?
body: <p>I'm using hash keys to store user details like:</p>
  
  <pre><code> hmset user:1 user_name lee  age 21
   hmset user:2 user_name david  age 25
   hmset user:3 user_name chris  age 25
  </code></pre>
  
  <p>I need to search for users having <code>age = 25</code>, <code>name = lee</code>. How to do a search for a specified value in a given field?</p>