Unrecognized escape \Q passed through in regex

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Unrecognized escape \Q passed through in regex; marked by &lt;-- HERE 
+in m/\b\Q &lt;-- HERE Renata\E\b/ at -e line 1.
Unrecognized escape \E passed through in regex; marked by &lt;-- HERE 
+in m/\b\QRenata\E &lt;-- HERE \b/ at -e line 1.

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# ...
print STDERR "/$regexp/\n";
$throw_away = ($window =~ /$regexp/ism) ? 'TRUE' : 'FALSE';
# ...

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/\b\QRenata\E\b/

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