($re=$_)=~s/((begin)|(end)|.)/${['(','']}[!$2]\Q$1\E${[')','']}[!$3]/g
+s;
$re = join'|',map quotemeta,eval{/$re/};
$re = qr/$re/;

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In reply to Re: Matching nested begin/ends by I0
in thread Matching nested begin/ends by Abigail-II

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