title: sed rare-delimiter (other than & | / ?...)
body: <p>I am using the Unix <code>sed</code> command on a string that can contain all types of characters (<code>&amp;</code>, <code>|</code>, <code>!</code>, <code>/</code>, <code>?</code>, etc).</p>
  <p>Is there a complex delimiter (with two characters?) that can fix the error:</p>
  <pre><code>sed: -e expression #1, char 22: unknown option to `s'
  </code></pre>