From: Tim X <timx@nospam.dev.null>
To: help-gnu-emacs@gnu.org
Subject: Re: regex-opt does not accept 'symbol as second arg?
Date: Sun, 12 Oct 2008 12:45:32 +1100 [thread overview]
Message-ID: <87vdvy8u2r.fsf@lion.rapttech.com.au> (raw)
In-Reply-To: mailman.850.1223727025.25473.help-gnu-emacs@gnu.org
Nikolaj Schumacher <me@nschum.de> writes:
> "Lennart Borgman" <lennart.borgman@gmail.com> wrote:
>
>> On Sat, Oct 11, 2008 at 12:02 PM, Xah <xahlee@gmail.com> wrote:
>>> the regexp-opt accept a second argument of "'word", but it doesn't
>>> accept "'symbol"?
>>>
>>> Shouldn't it?
>
> Sure, why not.
>
>> Would not the semantics be exactly the same?
>
> No, "\\<\\(\\w\\|\\s_+\\)+" (word delimiters) doesn't match the entire
> lisp symbol `-test'.
In emacs 23, it appears to be working as it is supposed to. It does take
an arbitrary symbol, but the symbol "'words" has special meaning over just a
non-nil value e.g.
ELISP> (regexp-opt '("This" "That" "Those"))
"\\(?:Th\\(?:at\\|is\\|ose\\)\\)"
ELISP> (regexp-opt '("This" "That" "Those") t)
"\\(Th\\(?:at\\|is\\|ose\\)\\)"
ELISP> (regexp-opt '("This" "That" "Those") 'words)
"\\<\\(Th\\(?:at\\|is\\|ose\\)\\)\\>"
ELISP> (regexp-opt '("This" "That" "Those") 'test)
"\\(Th\\(?:at\\|is\\|ose\\)\\)"
ELISP> (regexp-opt '("This" "That" "Those") 'symbol)
"\\(Th\\(?:at\\|is\\|ose\\)\\)"
ELISP>
Note that the "special meaning" symbol is 'words and not 'word.
Tim
P.S. From memory, I think an older version of regexp-opt actually took
an additional two symbols, one added the regexp grouping construct and
the other added the word boundry \< and \>.
--
tcross (at) rapttech dot com dot au
next prev parent reply other threads:[~2008-10-12 1:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-11 10:02 regex-opt does not accept 'symbol as second arg? Xah
2008-10-11 11:41 ` Lennart Borgman
2008-10-11 12:10 ` Nikolaj Schumacher
2008-10-11 12:20 ` Lennart Borgman
2008-10-11 13:01 ` Nikolaj Schumacher
2008-10-11 14:03 ` Lennart Borgman
[not found] ` <mailman.850.1223727025.25473.help-gnu-emacs@gnu.org>
2008-10-12 1:45 ` Tim X [this message]
2008-10-12 10:17 ` Nikolaj Schumacher
[not found] ` <mailman.880.1223806646.25473.help-gnu-emacs@gnu.org>
2008-10-13 7:48 ` Tim X
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