dzsyn-comment"># -&gt; nil</span>
(<span class="mdzsyn-coresym">peg/match</span> '(<span class="mdzsyn-coresym">set</span> <span class="mdzsyn-string">"AZ"</span>) <span class="mdzsyn-string">"F"</span>) <span class="mdzsyn-comment"># -&gt; nil</span>
(<span class="mdzsyn-coresym">peg/match</span> '(<span class="mdzsyn-coresym">set</span> <span class="mdzsyn-string">"ABCDEFGHIJKLMNOPQRSTUVWXYZ"</span>) <span class="mdzsyn-string">"F"</span>) <span class="mdzsyn-comment"># -&gt; @[]</span></code></pre><h2>Co