The deferred interpolation of scalars in a regex can still be depended on if the deference of all the various interpolations involved can be synched up properly.
(However, I share the suspicions of others about this approach to what seems like a templating problem.)
>perl -wMstrict -le
"my $rx = qr{ foo/bar }xms;
print $rx;
;;
my $str = 'xx foo/bar yy';
eval qq{
print q{match} if \$str =~ \$rx;
my \$ry = q{$rx};
print qq{captured '\$1'} if \$str =~ m/(\$ry)/;
};
$@ and die qq{eval err: $@};
"
(?^msx: foo/bar )
match
captured 'foo/bar'
Update: Slightly altered example code to more closely match my previous post.
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