Jeffrey C. Jacobs added the comment:
If I recall, I started this thread with a plan to update re itself with
implementations of various features listed in the top post. If you look at the
list of files uploaded by me there are seme complete patches for Re to add
various features like Atomic
Jeffrey C. Jacobs added the comment:
Thanks Matthew and sorry to put you through more work; I just wanted to verify
exactly which unicode (UTF-16 I take it) were being used to verify if the
UNICODE standard expected them to be treated as unique words or single letters
within a word. Sanskrit
Jeffrey C. Jacobs added the comment:
Matthew, I think that is considered a single word in Sanscrit or Thai so Python
3.x is correct. In this case you've written the Sanscrit word for Hindi.
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Jeffrey C. Jacobs added the comment:
Maybe you could show us the byte-for-byte hex of the string you're testing so
we can examine if it's really a code point intending word boundary or just a
code point for the sake of beginning a new character
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Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
Although V1, V2 is less wordy, technically the current behavior is version
2.2.2, so logically this should be re.VERSION222 vs. re.VERSION3 vs.
re.VERSIONn, with corresponding (?V222), (?V3) and future (?Vn). But
that said
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
On 1 September 2011 16:12, Matthew Barnett rep...@bugs.python.org wrote:
Matthew Barnett pyt...@mrabarnett.plus.com added the comment:
I think I need a show of hands.
For my part, I recommend literal flags, i.e
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
+1 on VC
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Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
What about a regex flag? Like regex.W or (?w)?
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Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
My only addition opinion is that re is very much used in deployed python
applications and was written not just for correctness but also speed. As such,
regex should be benchmarked fairly to show that it is commensurately
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
/lurk
Re: timings
Thanks for the info, John. First of all, I really like those tests and
could you please submit a patch or other document so that we could
combine them into the python test suite.
The python test suite
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
Mea culpa et mes apologies,
The '-s' option to John's expressions are indeed executed only once --
they are one-time setup lines. The final quoted expression is what's
run multiple times.
In other words, improving caching
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
Okay, as I said, Atomic Grouping, etc., off a recent 2.6 is already
available and I can do any cleanups requested to those already
mentioned, I just don't want to start any new items at the moment. As
it is, we are still
Jeffrey C. Jacobs timeho...@users.sourceforge.net added the comment:
Thanks, Antione! Then I think for the most part any changes to Regexp
will have to wait for 3.2 / 2.7.
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
The duplicate zero-or-one repeat operator bug described in this issue
originally no longer exists in python 2.6.
However, Trent Mick brings up a fair point in that expressions of the
form (x*)? generate an error (issue 1456280) when
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
This is another version of the redundant repeat issue defined in issues
2537 and 1633953 and although not described by the original report for
issue 214033, the comments further down that issue also describe a
similar situation
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
On first blush, this issue sounds quite similar to issue 2537, but I
have been looking at different scenarios and found that there is a
subtle difference because, grammatically:
(?m)(?:.*$)(.*$)
is the same as:
(?m)(.*$){2}
Yet
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Good work, Matthew. Now, another bazaar hint, IMHO, is once of my
favourite commands: switch. I generally develop all in one directory,
rather than getting a new directory for each branch. Once does have to
be VERY careful to type bzr
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Matthew, I've traced down the patch failures in my merges and now each
of the 4 versions of code on Launchpad should compile, though the first
2 do not pass all the negative look-behind tests, though your later 2
do. Any chance you could
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Implementing Issue 3482 should solve this problem, and I will try to add
it to issue 2636 so that it is captured in the general Regexp 2.7
redesign.
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Tested on 2.6rc2 and slow but successful. Issue 1662851 may be related.
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Matthew,
Did you upload a public SSH key to your Launchpad account?
You're on MS Windows, right? I can try and do an install on an MS
Windows XP box or 2 I have lying around and see how that works, but we
should try and solve this vexing
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Great, Matthew!!
Now, I'm still in the process of setting up branches related to your
work; generally they should be created from a core and set of features
implemented for example:
To get from Version 2 to Version 3 of your Engine, I had
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Thanks, Matthew. My reading of that Answer is that you should be okay
because you, I assume, installed the Windows-Native package rather than
the cygwin that I first tested. I think the problem is specific to
Cygwin as well
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Phew! Okay, all you patches have been applied as I said in a previous
message, and you should now be able to check out
lp:~pythonregexp2.7/python/issue2636+01+09-02+17+18+19+20+21+24+26 where
you can then apply your latest known patch (rc2
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
To clarify, you mean named character sets as found in Perl and Emacs,
which are normally written, for example, like '[:ALPHANUM:]', right? We
are working on that as Item 8 of Issue 2636: Regexp 2.7. If not, please
clarify so I nknow what
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I've enumerated the current list of Item Numbers at the official
Launchpad page for this issue:
https://launchpad.net/~pythonregexp2.7
There you will find links to each development branch associated with
each item, where a broader
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
It seems that changing the size type of the Regular Expression Byte-code
is a nice quick-fix, even though it doubles the size of a pattern. It
may have the added benefit that most machine architectures available
today are at least partially
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Good catch, Matthew, and if you spot any other outstanding Regular
Expression issues feel free to mention them here.
I'll give issue 1160 an item number of 25 and think all we need to do
here is change SRE_CODE to be typedefed
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Perl gives this result for your new expression:
,undef,undef
undef,undef,abc
undef,,undef
I think it has to do with not thinking of a string as a sequence of
characters, but as a sequence of characters separated by null-space.
Null-space
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Hmmm. Well, some of those are already covered:
#2636: self
#1160: Item 25
#1647489 : Item 24
#3511: Item 23
#3825: Item 9-2
#433028 : Item 21
#433027 : Item 20
#433024 : Item 19
#3262: Item 22
#3299: TBD
#3665
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Matthew,
I am really happy that you are making such progress on your engine, but
can I PLEASE ask you to slow down for a moment? We have a lot of issues
already listed in issue 2636 that is a catch-all for any Python 2.7
Regexp
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I think this is even more complicated when you consider that
localization my be an issue. Consider Á: is this grammatically before
A or after a? From a character set point of view, it is typically
after a but when Locale is taken
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Thanks for weighing in Matthew!
Yeah, I do get some flack for item 2 because originally item 3 wasn't
supposed to cover named groups but on investigation it made sense that
it should. I still prefer 2 over-all but the nice thing about them
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Hmmm. This strikes me as a bug, beyond the realm of Issue 3262. The
two items may be related, but the dropping of the 'a' seems like
unexpected behaviour that I doubt any current code is expecting to
occur. Clearly, what is going
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Never mind inclusion in 2.6 as no-one has repeated this bug in re-world
examples yet so it's going to have to wait for the Regexp 2.7 engine in
issue 2636.
--
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Ah, I see the problem, if ptr is not incremented, then it will keep
matching the first expression, (^z*), so it would have to both 'skip'
the 'a' and NOT skip the 'a'. Hmm. You're right, Matthew, this is
pretty complicated. Now, for your
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Good catch on issue 1647489 Matthew; it looks like this is where that
bug fix will end up going. But, I am unsure if the solution for this
issue is going to be the same as for 3262. I think the solution here is
to add an internal flag
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I've moved all the development branches to the ~pythonregexp2.7 team so
that we can work collaboratively. You just need to install Bazaar, join
www.launchpad.net, upload your public SSH key and then request to be added
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I think Mike Coleman proposal of enabling this behaviour via flag is
probably best and IMHO we should consider it under these circumstances.
Intuitively, I think you're interpretation of what re.split should do
under zero-width conditions
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Update 16 Sep 2008:
Based on the work for issue #3825, I would like to simply update the
item list as follows:
1) Atomic Grouping / Possessive Qualifiers (See also Issue #433030)
[Complete]
2) Match group names as attributes (e.g
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Well, I implemented this months ago, but have been busy with other
things so I haven't updated in a while. I noticed that the current
version is missing my patches for Atomic Grouping / Possessive
Qualifiers and a number of other patches I
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I have uploaded my test cases for Atomic Grouping / Possessive
Qualifier, which is the common code we seem to have developed, as this
may be of use to you. I also have documentation, but for now, would you
mind running these tests against
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Thanks for weighing in Mark! Actually, your point is valid and quite
fair, though I would not assume that Item 3 would be included just
because Item 2 isn't. I will do my best to develop both, but I do not
make the final decision
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Well, it's time for another update on my progress...
Some good news first: Atomic Grouping is now completed, tested and
documented, and as stated above, is classified as issue2636-01 and
related patches. Secondly, with caveats listed
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I have finished work on the Atomic Grouping / Possessive Qualifiers
support and am including a patch to achieve this; however,
http://bugs.python.org/issue2636 should be consulted for the complete list
of changes in the works
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Sorry, as I stated in the last post, I generated the patches then realized
that I was missing the documentation for Item 2, so I have updated the
issue2636-02.patch file and am attaching that separately until the next
release of the patch
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Mark scribbled:
One possible solution would be a grouptuples() function that returned
a tuple of 3-tuples (index, name, captured_text) with the name being
None for unnamed groups.
Hmm. Well, that's not a bad idea at all IMHO and would
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I am finally making progress again, after a month of changing my
patches from my local svn repository to bazaar hosted on launchpad.net,
as stated in my last update. I also have more or less finished the
probably easiest item, #5, so I
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I am making my changes in a Bazaar branch hosted on Launchpad. It took
me quite a while to get things set up more-or-less logically but there
they are and I'm currently trying to re-apply my local changes up to
today into the various
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Thank you and Merci Antoine!
That is a good point. It is clearly specific to the compiler whether a
switch-case will be turned into a series of conditional branches or
simply creating an internal jump table with lookup. And it is true
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Quick update (see thread 2636 for other updates to the Regex
functionality): I do have a design in my mind for how to accomplish both
Atomic Grouping and Possessive Qualifiers and it would work with either
the existing Engine design
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Thanks Jim for your thoughts!
Armaury has already explained about Perl 5.10.0. I suppose it's like
Macintosh version numbering, since Mac Tiger went from version 10.4.9 to
10.4.10 and 10.4.11 a few years ago. Maybe we should call Python
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
This simple patch adds (?P#...)-style comment support.
Added file: http://bugs.python.org/file10056/issue2636-05.patch
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Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I am very sorry to report (at least for me) that as of this moment, item
9), although not yet complete, is stable and able to pass all the
existing python regexp tests. Because these tests are timed, I am using
the timings from the first
New submission from Jeffrey C. Jacobs [EMAIL PROTECTED]:
I am working on adding features to the current Regexp implementation,
which is now set to 2.2.2. These features are to bring the Regexp code
closer in line with Perl 5.10 as well as add a few python-specific
niceties and potential speed
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
I'm digging into the sre_parse.py at the moment and this I have all the
changes I need for that now. The rest of the changes I believe are in
either sre_compile.py or more likely directly in _sre.c, so I will
examine those files next. I
Jeffrey C. Jacobs [EMAIL PROTECTED] added the comment:
Fredrik,
If you're still listening, I am gonna try and tackle this one but I
would like to know why you or the famous Jeffrey of the Regexp world
claims that there is already code in the Regexp Engine for Atomic
Grouping? Adding a hook
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