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Re^3: Named capture backreferences cannot be used in character classes?

by kcott (Abbot)
on Sep 27, 2013 at 13:09 UTC ( #1055975=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Named capture backreferences cannot be used in character classes?
in thread Named capture backreferences cannot be used in character classes?

"... I don't have a problem with it being "experimental"; as far as I have observed it hasn't changed in all the years it has been there ..."

When I read that this afternoon, that was my understanding too. However, poking aroung in perl5180delta some hours later (on a completely unrelated matter), I found: "/(?{})/ and /(??{})/ have been heavily reworked".

That's really just an FYI, if you're interested. It's still marked "experimental" and I saw nothing to indicate any specific performance enhancements.

-- Ken


Comment on Re^3: Named capture backreferences cannot be used in character classes?
Re^4: Named capture backreferences cannot be used in character classes?
by BrowserUk (Pope) on Sep 27, 2013 at 13:43 UTC
    That's really just an FYI,

    Thanks for the heads up. I haven't moved onto 5.18 yet, but I will be doing so soon.

    Thankfully, my primary use of the feature is where I have regex elements that are codependent. EG.

    A => qr[...${B()}...], B => qr[...${C()}...], C => qr[...${A()}...],

    Which doesn't work because there is no way to order them such that all dependancies can be resolved at compile-time.

    Instead I have to use:

    A => qr[...(??{B()})...], B => qr[...(??{C()})...], C => qr[...(??{A()})...],

    Which doesn't seem to be affected by the changes.


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