int/HilExp/index.html#type-t">Absint.HilExp.t</a> list</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span>
  <a href="#type-t">t</a></span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-regex_op" class="anchored"><a href="#val-regex_op" class="anchor"></a><code><span><span class="keyword">val</span> regex_op : <span>callee:<a href="../../IR/Procname/index.html#type-t">IR.Procname.t</a> <span class="arrow">&