On Sat, Feb 18, 2012 at 21:16, Vik Reykja vikrey...@gmail.com wrote:
I would be willing to have a go at translating test cases. I do not (yet)
have the C knowledge to maintain the regex code, though.
I got suddenly swamped and forgot I had signed up for this. I'm still
pretty swamped and I
Vik Reykja vikrey...@gmail.com writes:
On Sat, Feb 18, 2012 at 21:16, Vik Reykja vikrey...@gmail.com wrote:
I would be willing to have a go at translating test cases. I do not (yet)
have the C knowledge to maintain the regex code, though.
I got suddenly swamped and forgot I had signed up for
Jay,
Good links, and I've also looked at a few others with benchmarks. I
believe most of the benchmarks are done before PCRE implemented jit. I
haven't found a benchmark with jit enabled, so I'm not sure if it will make
a difference. Also I'm not sure how accurately the benchmarks will show
Billy Earney billy.ear...@gmail.com writes:
Also would it be possible to set a session variable (lets say PGREGEXTYPE)
and set it to ARE (current alg), RE2, or PCRE, that way users could choose
which implementation they want (unless we find a single implementation that
beats the others in
Tom,
Thanks for your reply. So is the group leaning towards just maintaining
the current regex code base, or looking into introducing a new library
(RE2, PCRE, etc)? Or is this still open for discussion?
Thanks!
Billy
On Mon, Feb 20, 2012 at 3:35 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Billy Earney billy.ear...@gmail.com writes:
Thanks for your reply. So is the group leaning towards just maintaining
the current regex code base, or looking into introducing a new library
(RE2, PCRE, etc)? Or is this still open for discussion?
Well, introducing a new library would create
On 19 February 2012 15:49, Tom Lane t...@sss.pgh.pa.us wrote:
That sounds great.
BTW, if you don't have it already, I'd highly recommend getting a copy
of Friedl's Mastering Regular Expressions. It's aimed at users not
implementers, but there is a wealth of valuable context information in
Brendan Jurd dire...@gmail.com writes:
Are you far enough into the backrefs bug that you'd prefer to see it
through, or would you like me to pick it up?
Actually, what I've been doing today is a brain dump. This code is
never going to be maintainable by anybody except its original author
On 20 February 2012 10:42, Tom Lane t...@sss.pgh.pa.us wrote:
I have also got
a bunch of text about the colormap management code, which I think
is interesting right now because that is what we are going to have
to fix if we want decent performance for Unicode \w and related
classes (cf the
Tom,
I did a google search, and found the following:
http://www.arglist.com/regex/
Which states that Tcl uses the same library from Henry. Maybe someone
involved with that project would help explain the library? Also I noticed
at the url above is a few ports people did from Henry's code. I
Billy Earney billy.ear...@gmail.com writes:
I did a google search, and found the following:
http://www.arglist.com/regex/
Hmm ... might be worth looking at those two pre-existing attempts at
making a standalone library from Henry's code, just to see what choices
they made.
Which states that
Thanks Tom. I looked at the code in the libraries I referred to earlier,
and it looks like the code in the regex directory is exactly the same as
Walter Waldo's version, which has at least one comment from the middle of
last decade (~ 2003). Has people thought about migrating to the pcre
Billy,
* Billy Earney (billy.ear...@gmail.com) wrote:
Thanks Tom. I looked at the code in the libraries I referred to earlier,
and it looks like the code in the regex directory is exactly the same as
Walter Waldo's version, which has at least one comment from the middle of
last decade (~
On Sat, Feb 18, 2012 at 6:15 PM, Tom Lane t...@sss.pgh.pa.us wrote:
A larger point is that it'd be a real shame
for the Spencer regex engine to die off, because it is in fact one of
the best pieces of regex technology on the planet.
...
Another possible long-term answer is to finish the work
Greg,
* Greg Stark (st...@mit.edu) wrote:
I can't see how your first claim that the Spencer code is worth
keeping around because it's just a superior regex implementation has
much force unless we can accomplish the latter. If the library can be
split off into a standalone library then it
Greg Stark st...@mit.edu writes:
... We need a library that can be used to defend
against malicious regexes and i suspect neither Perl's nor Python's
library will suffice for this.
Yeah. Did you read the Russ Cox papers referenced upthread? One of the
things Google wanted was provably
On 02/19/2012 10:28 PM, Greg Stark wrote:
One thing that concerns me more and more is that most sufficiently
powerful regex implementations are susceptible to DOS attacks.
There's a list of evil regexes at http://en.wikipedia.org/wiki/ReDoS
The Perl community's reaction to Russ Cox's regex
Stephen Frost wrote:
Alright, I'll bite.. Which existing regexp implementation that's well
written, well maintained, and which is well protected against malicious
regexes should we be considering then?
FWIW, there's a benchmark here that compares a number of regexp engines,
including PCRE,
On Sat, Feb 18, 2012 at 6:15 PM, Tom Lane t...@sss.pgh.pa.us wrote:
So I'm feeling that we gotta suck it up and start acting like we are
the lead maintainers for this code, not just consumers.
By we, I take it you mean you personally?
There are many requests I might make for allocations of
* Simon Riggs (si...@2ndquadrant.com) wrote:
On Sat, Feb 18, 2012 at 6:15 PM, Tom Lane t...@sss.pgh.pa.us wrote:
So I'm feeling that we gotta suck it up and start acting like we are
the lead maintainers for this code, not just consumers.
By we, I take it you mean you personally?
I'm
Stephen Frost sfr...@snowman.net writes:
* Simon Riggs (si...@2ndquadrant.com) wrote:
Do we have volunteers that might save Tom from taking on this task?
It's not something that requires too much knowledge and experience of
PostgreSQL, so is an easier task for a newcomer.
Sure, it doesn't
On Sat, Feb 18, 2012 at 7:52 PM, Tom Lane t...@sss.pgh.pa.us wrote:
One immediate consequence of deciding that we are lead maintainers and
not just consumers is that we should put in some regression tests,
instead of taking the attitude that the Tcl guys are in charge of that.
I have a head
On Sat, Feb 18, 2012 at 21:04, Simon Riggs si...@2ndquadrant.com wrote:
On Sat, Feb 18, 2012 at 7:52 PM, Tom Lane t...@sss.pgh.pa.us wrote:
One immediate consequence of deciding that we are lead maintainers and
not just consumers is that we should put in some regression tests,
instead of
On 02/18/2012 02:25 PM, Stephen Frost wrote:
Do we have volunteers that might save Tom from taking on this task?
It's not something that requires too much knowledge and experience of
PostgreSQL, so is an easier task for a newcomer.
Sure, it doesn't require knowledge of PG, but I dare say
Vik Reykja vikrey...@gmail.com writes:
On Sat, Feb 18, 2012 at 21:04, Simon Riggs si...@2ndquadrant.com wrote:
Translating the test cases is a great way in for a volunteer, so
please leave a few easy things to get people started on the road to
maintaining that.
I would be willing to have a
Tom Lane t...@sss.pgh.pa.us writes:
Yeah ... if you *don't* know the difference between a DFA and an NFA,
you're likely to find yourself in over your head. Having said that,
So, here's a paper I found very nice to get started into this subject:
http://swtch.com/~rsc/regexp/regexp1.html
If
Dimitri Fontaine dimi...@2ndquadrant.fr writes:
Tom Lane t...@sss.pgh.pa.us writes:
Yeah ... if you *don't* know the difference between a DFA and an NFA,
you're likely to find yourself in over your head. Having said that,
So, here's a paper I found very nice to get started into this subject:
On Sun, Feb 19, 2012 at 1:55 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Dimitri Fontaine dimi...@2ndquadrant.fr writes:
Tom Lane t...@sss.pgh.pa.us writes:
Yeah ... if you *don't* know the difference between a DFA and an NFA,
you're likely to find yourself in over your head. Having said that,
On Sat, Feb 18, 2012 at 7:24 PM, Marko Kreen mark...@gmail.com wrote:
About our Spencer code - if we don't have resources (not called Tom)
Is there anything that would be worth talking about directly with
Henry? He's in one of my circles of colleagues; had dinner with a
group that included him
Christopher Browne cbbro...@gmail.com writes:
On Sat, Feb 18, 2012 at 7:24 PM, Marko Kreen mark...@gmail.com wrote:
About our Spencer code - if we don't have resources (not called Tom)
Is there anything that would be worth talking about directly with
Henry? He's in one of my circles of
On 19 February 2012 06:52, Tom Lane t...@sss.pgh.pa.us wrote:
Yeah ... if you *don't* know the difference between a DFA and an NFA,
you're likely to find yourself in over your head. Having said that,
this is eminently learnable stuff and pretty self-contained, so somebody
who had the time and
Brendan Jurd dire...@gmail.com writes:
On 19 February 2012 06:52, Tom Lane t...@sss.pgh.pa.us wrote:
Yeah ... if you *don't* know the difference between a DFA and an NFA,
you're likely to find yourself in over your head. Having said that,
this is eminently learnable stuff and pretty
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