* shy grouping
@ 2004-01-08 6:05 Katsumi Yamaoka
2004-01-08 12:29 ` Katsumi Yamaoka
0 siblings, 1 reply; 2+ messages in thread
From: Katsumi Yamaoka @ 2004-01-08 6:05 UTC (permalink / raw)
Hi,
I recognized using the `shy grouping' makes regexp search work a
bit faster. Here are benchmarks (I'm using Lars' benchmark.el):
(and (string-match "\\(a\\)\\(b\\)\\(c\\)\\(d\\)\\(e\\)" "abcde")
(match-data))
=> (0 5 0 1 1 2 2 3 3 4 4 5)
(benchmark 1000
(string-match "\\(a\\)\\(b\\)\\(c\\)\\(d\\)\\(e\\)" "abcde"))
0.0013788938522338867
0.001417994499206543
0.0013669729232788086
0.0013679265975952148
0.0013790130615234375
(and (string-match "\\(?:a\\)\\(?:b\\)\\(?:c\\)\\(?:d\\)\\(?:e\\)" "abcde")
(match-data))
=> (0 5)
(benchmark 1000
(string-match "\\(?:a\\)\\(?:b\\)\\(?:c\\)\\(?:d\\)\\(?:e\\)" "abcde"))
0.0009989738464355469
0.0010300874710083008
0.0009980201721191406
0.0010030269622802734
0.000986933708190918
I am actually using Gnus which modified regexp strings of many,
it doesn't seem to work faster than yesterday, though. ;-)
Therefore, I decided not to install it unless there's a request.
By the way, I found a bug in XEmacs yet again. The `shy
grouping' cannot be used in some case as follows:
(string-match "\\(?:^\\|:\\)foo" "foo")
=> nil
It is just applied to `gnus-group-charset-alist'. Please
remember this, when you need to use the `shy grouping'.
--
Katsumi Yamaoka <yamaoka@jpl.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: shy grouping
2004-01-08 6:05 shy grouping Katsumi Yamaoka
@ 2004-01-08 12:29 ` Katsumi Yamaoka
0 siblings, 0 replies; 2+ messages in thread
From: Katsumi Yamaoka @ 2004-01-08 12:29 UTC (permalink / raw)
BTW, I found strange things while scanning all regexp strings
in Gnus. Please ignore this message supposing they are under
development.
nnwarchive.el: nnwarchive-egroups-list
The regexp string contains only one subexpression.
(while
(re-search-forward "href=\"/group/\\([^/\"\> ]+\\)" nil t)
(setq group (match-string 1)
description (match-string 2))
nnweb.el: nnweb-gmane-wash-article
Same as above.
(while (looking-at "^<li><em>\\([^ ]+\\)</em>.*</li>")
(replace-match "\\1\\2" t)
pgg-parse.el: pgg-armor-header-lines
It seems unused.
--
Katsumi Yamaoka <yamaoka@jpl.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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