ss="fu"><a href="https://rdrr.io/r/base/sys.parent.html" class="external-link">parent.frame</a></span><span class="op">(</span><span class="op">)</span>,</span>
<span>  enclos <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/sys.parent.html" class="external-link">parent.frame</a></span><span class="op">(</span><span class="op">)</span>,</span>
<span>  match_pattern <span class="op">=</span> <span class="st">"\\.\\((([^()]+)|(\\([^()]*\\)))+\\)"</span>,</span>
<span>  removal_patter