Do you really need to stringize the entire if-statement? If you can get away with it, it's much simpler to use the stringized regex object on its own. (When a match such as m// or s/// is compiled, the compiler looks for terminating delimiters before interpolating scalars, so embedded '/' characters in the scalars should not be a problem.) (Also: The =~ operator will bind to a plain old string.)
>perl -wMstrict -le
"my $rx = qr{ foo/bar }xms;
print 'ref: ', ref $rx;
$rx = qq{$rx};
print 'de-refized: ', ref $rx;
print $rx;
;;
my $str = 'xx foo/bar yy';
print 'match' if $str =~ $rx;
print qq{captured '$1'} if $str =~ m/($rx)/;
"
ref: Regexp
de-refized:
(?^msx: foo/bar )
match
captured 'foo/bar'
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