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Re: a function for string splitting
From: |
Luis O. Silva |
Subject: |
Re: a function for string splitting |
Date: |
Tue, 26 Nov 2002 22:59:28 +0300 |
Dear Lee,
On 26 Nov 2002 15:49:00 +0100, Lee Sau Dan writes:
Luis> My question is what function I could use for
Luis> correctly splitting the string.
Luis> Please be indulgent with me since
Luis> 1. I'm not a programmer 2. I don't have access to the
Luis> elisp manual even on-line (my connection is very
Luis> slow, only sufficient to download my e-mail).
Lee> Consider learning "regular expressions", which are not
Lee> only useful in Emacs, but also useful throughout the
Lee> unix environment (e.g. grep, sed, awk, vi, ...).
Lee> Try:
Lee> (let ((date-string "Thu, 21 Nov 2002 16:05:50 -0600")
Lee> (regex-fragment-1 "\\([A-Z][a-z]*\\), ")
Lee> (regex-fragment-2 "\\([0-9]+\\)\\([A-Z][a-z]*\\)\\([0-9]+\\) ")
Lee> (regex-fragment-3 "\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\) ")
Lee> (regex-fragment-4 "\\([+-][0-9]*\\)" ))
Lee> (if (string-match (concat regex-fragment-1
Lee> regex-fragment-2
Lee> regex-fragment-3
Lee> regex-fragment-4)
Lee> date-string)
Lee> (let ((day-of-week (match-string 1 date-string))
Lee> (day (match-string 2 date-string))
Lee> (month-name (match-string 3 date-string))
Lee> (year (match-string 4 date-string))
Lee> (hour (match-string 5 date-string))
Lee> (minute (match-string 6 date-string))
Lee> (second (match-string 7 date-string))
Lee> (tz-spec (match-string 8 date-string)))
Lee> (list day month-name year hour minute second tz-spec))))
Thank you very much. This is just what I needed. I have an
incipient notion of regular expressions and I had used them to
do search in buffers. I didn't know of the existence of the
function `string-match'.
Lee> Note that I've broken up the regex into 4 fragments to
Lee> make it usenet friendly, rejoining them with (concat
Lee> ...). This is not really necessary.
Yes, it is not necessary but this nicety will also be useful
for me. Thanks a lot.
Regards,
luis
--
Luis Octavio Silva P.
St. Petersburg State University.
66/3 Botanicheskaya St., Apt.119/2
Stary Peterhof
St. Petersburg, Russia.
Re: a function for string splitting, Greg Hill, 2002/11/26