title: How to apply "filter" based on regular expression?
body: <p>Is it possible to apply filter based on a regular expression? What I had in mind was something like</p>
  
  <pre><code>(filter #"&lt;+\p{Alnum}+&gt;" ["abc" "&lt;def&gt;"])
  </code></pre>
  
  <p>to return</p>
  
  <pre><code>=&gt; ["&lt;def&gt;"]
  </code></pre>
  
  <p>Thanks in advance for hints.</p>