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$regex = qr/(this)is[a]test/i;
$regex = "$regex"; $regex = qr/$regex/;  # simulate freeze/thaw cycle
...
print "regex:  qr{$regex}\n";
__OUTPUT__
regex:  qr{(?-xism:(?-xism:(?-xism:(?i-xsm:(this)is[a]test))))}