title: --scan --pattern *some_numbers* couldn't find most of my keys
body: <p>My redis store keys that looked like this</p>
  <pre><code>behavior:5c3c841c6efcbd1a6c066b48#20210125
  behavior:5ea04f8b3d79784a29e02d37#20210110#submissionCount
  kelas:5c73be3be611a06042041f0a#behavior:5f9a70b8c7f67353e8cd5969#20210104#studentCount
  student:5c497fdd422c7d511918cc78#behavior:5c49114902b1de4a801b556b#20210123
  teacher:5ef1c48fa4fee10f9817b5b2#20210126
  </code></pre>
  <p>But now I want to delete some of the keys. So I thought running this</p>
  <pre><code>redis-cli -n 1 --scan --pattern *202101* | xargs redis-cli unlink
  </code></pre>
  <p>will delete all the keys listed above, since all the keys above have <code>202101</code> inside it. But I was wrong. Is there any way I can delete my keys by supplying pattern such as above?</p>