I'm taking a positivist approach to this. Where /i is specified it overrides, where it is not, it doesn't. So /$re/i has a local definition of /i but /$re/ doesn't. This implies that where a local redefinition occurs you've gained nothing in performance because the regex fragment must be recompiled to match the local expectations. I think that's just too bad. The alternative viewpoints here might be that the potential performance hit is unacceptable (even given the logical disconnect) or that a a regex fragment is actually a universe unto itself and just because it is included in a larger regex the larger regex's rules shouldn't apply.

I'm still holding out for a positivist interpretation of this.

I think you are missing the idea behind this,

 
$regex = qr/test/;
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this compiles to (?-xism:test) meaning you are stating that the string test must exist and be lowercase. so ...

if (/$regex OtherWord/i) {...}
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This seems very logical to me that this should match "test OTHERWORD" but not "TeSt OtherWord" as I have defined $regex to be case sensitive explicitly ! Are you really stating that you feel you need to

if (/(?-ixsm:$regex) OtherWord/i) { ... }
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to accomplish this case insensitivty on the qr var?? That just blows me away.

-Waswas

That is exactly what I'm saying. The fact that a qr// regex stringifies with a (?-xism:$re) wrapper doesn't mean to me that it is actually core to it. The regex itself is hard coded into some nodes which actually indicate which of 'ism' apply and its that that you're saying should remain static and I'm saying should bend. Now please keep in mind that I've moderated my stance a bit and I only think /i is acceptable to have this behaviour for. The other three flags 'x', 's' and 'm' have more significant meaning and I can't bring myself to think of a situation where it would make sense to override any of those.

So really, what I'm saying is that if you had previously said $test = qr/test/ and later said /$test FOO!/i that the /i-ness of the $test object would be overridden and that if you wanted to keep that you'd have to said /(?i:$test) FOO!/i. I had originally written $test = "test" then all of this would behave exactly as I'm suggesting. (except that 'xms' wouldn't be specified either).