[regex-coach] negative lookahead assertion bug?

[Arian Hojat]

i think the last email was right about the pattern needing to be
([A-Z]-)(?![^a-z]{3})([a-z0-9A-Z]* ),
this one is like a double NOT, almost right?

Now I'm just curious with a pattern like this.... This pattern
([A-Z]-)(?![^a-z]{3})
for text: A-xyz37 # B-ab6142 # C-Wxy66 # D-qrs93
matches
A-xyz37 # B-ab6142 # C-Wxy66 # D-qrs93

Its looking to make sure the next thing after Capital Letter dash isnt 3
lower case letters, then 'nots' it?
aka it really looks ahead for 3 lowercase letters, and i thought would only
match A- and D-.

Thanks for the help btw, I wasnt sure if these were problems with program or
just me understanding regexes bad :) which is most likely the case.
Arian


2008/5/21 Laurent TAUPIAC <ltaupiac at lfdj.com>:

>  Negative lookup assertion should match to be validate.
> If "Wxy" not match, the positive assertion failed.
>
> If you want a Capital letter followed by a dash but not followed by 3 lower
> case, you should match "not 3 lower case"
> ([A-Z]-)(?![^a-z]{3})([a-z0-9]* )
>
>
> Regards
>
> Arian Hojat a écrit :
>
> Hello all,
>
> had a question/possible bug report...
> For the example on this webpage:
> http://www.nuclearblender.com/leftovers/howto/regex/
>
> this pattern is presented and i tried a positive lookup assertion which
> worked, but this first negative one only matched the first pattern (global
> option is on btw, so not sure why wont match).
> Pattern: ([A-Z]-)(?![a-z]{3})([a-z0-9]* )
> Text to lookup: A-xyz37 # B-ab6142 # C-Wxy66 # D-qrs93
>
> Should match B-ab6142 and C-Wxy66 as they both (have a capital letter
> followed by a dash), then (dont have 3 lower case letters), and (are
> following by letters/numbers and a space)
> only matches first one in the program.
>
> Thanks, let me know if it should match only one if im wrong. Running latest
> version on Windows XP.
> Great Tool!
> Arian
>
> ------------------------------
>
> _______________________________________________
> regex-coach site listregex-coach at common-lisp.nethttp://common-lisp.net/mailman/listinfo/regex-coach
>
>
>
> --
>
>
>
>
>
> ---------------------------------------------------------------------
> Sorry, This disclamer is auto added by my company's FW
> ---------------------------------------------------------------------
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Si vous n'etes pas destinataires de ce message, merci d'avertir
> l'expediteur de l'erreur de distribution et de le detruire immediatement.
> Ce message contient des informations confidentielles ou appartenant a La
> Francaise des Jeux. Il est etabli a l'intention exclusive de ses
> destinataires. Toute divulgation, utilisation, diffusion ou reproduction
> (totale ou partielle) de ce message ou des informations qu'il contient, doit
> etre prealablement autorisee.
> Tout message electronique est susceptible d'alteration et son integrite ne
> peut etre assuree. La Francaise des Jeux decline toute responsabilite au
> titre de ce message s'il a ete modifie ou falsifie.
>
> If you are not the intended recipient of this e-mail, please notify the
> sender of the wrong delivery and delete it immediately from your system.
> This e-mail contains confidential information or information belonging to
> La Francaise des Jeux and is intended solely for the addressees. The
> unauthorised disclosure, use, dissemination or copying (either whole or
> partial) of this e-mail, or any information it contains, is prohibited.
> E-mails are susceptible to alteration and their integrity cannot be
> guaranteed. La Francaise des Jeux shall not be liable for this e-mail if
> modified or falsified.
> _______________________________________________
> regex-coach site list
> regex-coach at common-lisp.net
> http://common-lisp.net/mailman/listinfo/regex-coach
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.common-lisp.net/pipermail/regex-coach/attachments/20080521/f16f68dd/attachment.html>