title: Why I cannot use ZRANGEBYLEX on this sorted set in redis?
body: <p>In the redis documentation, there is this example of <code>ZRANGEBYLEX</code></p>
  
  <pre><code>ZADD myindex 0 0056:0028.44:90
  ZADD myindex 0 0034:0011.00:832
  ZRANGEBYLEX myindex [0056:0010.00 [0056:0030.00
  1) "0056:0028.44:90"
  </code></pre>
  
  <p>It is very straightforward.</p>
  
  <p>However if I want to apply the same technique to the following example, </p>
  
  <pre><code>127.0.0.1:6379&gt; zadd feedbacks 1 feedback1 2 feedback2 3 feedback3 1 feedback4
  (integer) 4
  127.0.0.1:6379&gt; ZRANGEBYLEX feedbacks [feed [feed
  (empty list or set)
  </code></pre>
  
  <p>I get an empty set. </p>
  
  <p>I would expect to see the four values (<code>feedback1</code> to <code>feedback4</code>)</p>
  
  <p>Why <code>ZRANGEBYLEX</code> failed on my test sample?</p>