Re: regex and
On Tue, Aug 10, 2010 at 9:00 PM, wrote: > Once the & operator is in rakudo, though... I gather I /could/ do something > like the following > > ^ [ * & ] $ > > And this would in effect ensued that the sequence "abc" doesn't exist > anywhere across the match for > > > Is this correct? > Not quite, I suspect – the is still zero-width, so unless quantified zero-width assertions are DWIMmier than what's healthy, this is likely still equivalent to ^$. I think the following should DWYW, though: ^ [ [ . ] * & ] $ ... though perhaps there is a shorter way to write [ . ]? Feels like there should be one ... Eirik
RE: regex and
Back to your original advice...
> If you want to match an alphabetic string which does not include 'abc'
> anywhere, you can write this as
>
> ^ [ ]* $
I presume this only works here because is one character... if instead
of I used anything more complicated
(for example)
token name
{
<[A..Z]>*
}
And then tried to do ^ [ ]* $
This wouldn't work since there's a wildcard within name.
Once the & operator is in rakudo, though... I gather I /could/ do something
like the following
^ [ * & ] $
And this would in effect ensued that the sequence "abc" doesn't exist anywhere
across the match for
Is this correct?
Re: regex and
philippe.beauch...@bell.ca wrote: > On the & operator... are you saying that it would operate basically as > expected... > allowing sets of rules and'ed rather than or's with the | ? Yes, with the limitation that both parts separated by & have to match the same length of string, so that for example ^ [ a+ & . ** 3 ] could only match exactly 3 a's. If you don't want to them tied to the same length, you look-ahead assertions instead. Cheers, Moritz
RE: regex and
Great! That does it. Thanks. :)
I realized my error on the anchors after sending... but didn't think of the *
on the grouping.
On the & operator... are you saying that it would operate basically as
expected... allowing sets of rules and'ed rather than or's with the | ?
--- Phil
-Original Message-
From: Moritz Lenz [mailto:mor...@faui2k3.org]
Sent: August 10, 2010 2:09 PM
To: Beauchamp, Philippe (6009210)
Cc: perl6-language@perl.org
Subject: Re: regex and
Hi,
philippe.beauch...@bell.ca wrote:
> rule TOP
> {
> ^
> [
> & *
> &
> ]
> $
> }
The & syntax is specced, but it's not yet implemented in Rakudo.
But note that is a zero-width assertion, so your example regex
matches at the start of a string, if it does not begin with 'abc'.
Since you anchor it to the end of string too, it can only ever match the
empty string.
You can achieve the same with just ^$.
If you want to match an alphabetic string which does not include 'abc'
anywhere, you can write this as
^ [ ]* $
Cheers,
Moritz
Re: regex and
Hi,
philippe.beauch...@bell.ca wrote:
> rule TOP
> {
> ^
> [
> & *
> &
> ]
> $
> }
The & syntax is specced, but it's not yet implemented in Rakudo.
But note that is a zero-width assertion, so your example regex
matches at the start of a string, if it does not begin with 'abc'.
Since you anchor it to the end of string too, it can only ever match the
empty string.
You can achieve the same with just ^$.
If you want to match an alphabetic string which does not include 'abc'
anywhere, you can write this as
^ [ ]* $
Cheers,
Moritz
regex and
Hi there...
New to the list and getting to understand perl6 after a bit of a hiatis from
the Perl world.
I'm working my way through the new grammar syntax trying to implement some
useful modules, and was wondering if there is a mechanism within the grammar
constructs to allow two rules to apply simultaneously in parallel (not
sequence).
In other words... I want to say that for a rule to pass it must pass two
contained rules completely.
Ie:
token abc
{
'abc'
}
rule TOP
{
^
[
& *
&
]
$
}
Such that the TOP rule would only match if a matching string consisted entirely
of alpha's AND did not contain the letter sequence "abc" anywhere in it.
(*note I know the & notation isn't legit ;)
r31939 -[S32::IO] update to new type names, remove some thinkos
Author: moritz Date: 2010-08-10 14:55:57 +0200 (Tue, 10 Aug 2010) New Revision: 31939 Modified: docs/Perl6/Spec/S32-setting-library/IO.pod Log: [S32::IO] update to new type names, remove some thinkos Modified: docs/Perl6/Spec/S32-setting-library/IO.pod === --- docs/Perl6/Spec/S32-setting-library/IO.pod 2010-08-10 11:50:30 UTC (rev 31938) +++ docs/Perl6/Spec/S32-setting-library/IO.pod 2010-08-10 12:55:57 UTC (rev 31939) @@ -712,7 +712,7 @@ has Str $.Encoding; has Buf $.Binary; has IO::ACL @.ACLs; -has Hash of %.times; +has %.times; ... } @@ -723,9 +723,9 @@ all are checked before being pushed onto the array. Note that @.Elements can not be accessed unless $.Encoding is defined. -The C<%times> has keys that can be e.g. C, C, and +The C<%.times> has keys that can be e.g. C, C, and C (and maybe others on other operating systems), and the values are -all C objects. +all C objects. When a Path is used as a Str, it allows some operations, so that it can be concatenated easily with other strings. When used as an Array, it @@ -743,7 +743,7 @@ This is called automatically on object creation. multi method new( -Str|Buf :$Path, +Stringy :$Path, Str :@PathElements, Str :$Encoding,
perl6-language@perl.org
Author: masak
Date: 2010-08-10 13:50:30 +0200 (Tue, 10 Aug 2010)
New Revision: 31938
Modified:
docs/Perl6/Spec/S32-setting-library/Str.pod
Log:
[S32/Str] nicer where clause for &pack
Reads better and is more amenable to compiler optimization. Suggested by
TheDamian++.
Modified: docs/Perl6/Spec/S32-setting-library/Str.pod
===
--- docs/Perl6/Spec/S32-setting-library/Str.pod 2010-08-10 09:47:45 UTC (rev
31937)
+++ docs/Perl6/Spec/S32-setting-library/Str.pod 2010-08-10 11:50:30 UTC (rev
31938)
@@ -269,7 +269,7 @@
=item pack
- our buf8 multi pack( *...@items where { [&&] @items »~~» Pair })
+ our buf8 multi pack( *...@items where { all(@items) ~~ Pair } )
our buf8 multi pack( Str $template, *...@items )
C takes a list of pairs and formats the values according to
r31937 -[S32/Str] fixed thinko in &pack signature
Author: masak
Date: 2010-08-10 11:47:45 +0200 (Tue, 10 Aug 2010)
New Revision: 31937
Modified:
docs/Perl6/Spec/S32-setting-library/Str.pod
Log:
[S32/Str] fixed thinko in &pack signature
Spotted by moritz++
Modified: docs/Perl6/Spec/S32-setting-library/Str.pod
===
--- docs/Perl6/Spec/S32-setting-library/Str.pod 2010-08-09 22:37:35 UTC (rev
31936)
+++ docs/Perl6/Spec/S32-setting-library/Str.pod 2010-08-10 09:47:45 UTC (rev
31937)
@@ -269,7 +269,7 @@
=item pack
- our buf8 multi pack( *...@items where { @items »~~» Pair })
+ our buf8 multi pack( *...@items where { [&&] @items »~~» Pair })
our buf8 multi pack( Str $template, *...@items )
C takes a list of pairs and formats the values according to
