[Emacs-bug-tracker] bug#1402: closed (suggestion: add 'symbol to regexp-opt's second parameter)

[GNU bug Tracking System]

Your message dated Sat, 09 Jul 2011 14:49:16 -0400
with message-id <address@hidden>
and subject line Re: bug#4392: (Regexp Functions): The PAREN argument to 
`regexp-opt' can be `symbols'.
has caused the GNU bug report #4392,
regarding suggestion: add 'symbol to regexp-opt's second parameter
to be marked as done.

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4392: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4392
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> --- Begin Message ---
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> Subject: 
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> suggestion: add 'symbol to regexp-opt's second parameter
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> Date: 
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> Fri, 21 Nov 2008 12:11:36 -0800
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> this is a suggestion.
>
> the function regexp-opt takes a second argument “'words” to make  
> the regex match word boundary. Perhaps it'd be useful to have  
> “'symbol” as the second argument as well.
>
> as far as i know, when people do like this when they need symbol:
>
> (concat "\\_<" (regexp-opt myLang-functions) ">_\\")
>
> having
>
> (regexp-opt myLang-functions 'symbol)
>
> would be convenient and seems to me consistent.
>
> For example, i currently have:
>
> (defvar xlsl-keywords-regexp (regexp-opt xlsl-keywords 'words))
> (defvar xlsl-type-regexp (regexp-opt xlsl-types 'words))
> (defvar xlsl-constant-regexp (regexp-opt xlsl-constants 'words))
> (defvar xlsl-event-regexp (regexp-opt xlsl-events 'words))
> (defvar xlsl-functions-regexp (regexp-opt xlsl-functions 'words))
>
> but i'd prefer that each is 'symbol. Using concat makes the code much  
> longer and less readable.
>
> Also, i think matching on symbol boundary is probably more commonly  
> needed than words, for language major modes.
>
> PS before i send this, i posted to gnu.emacs.help to see if this is  
> sensible question. It seems that either this is already supported in  
> the dev version of emacs, or that this can still use some  
> improvement. I'm logging this suggestion here to be sure. Here's the  
> thread:
>
> http://groups.google.com/group/gnu.emacs.help/browse_frm/thread/ 
> 289e42f24f21f65c
>
> subject: “regex-opt does not accept 'symbol as second arg?”
> date: 2008-10-11
>
>   Xah
> ∑ http://xahlee.org/
>
> ☄
>
>
>
> --- End Message ---
> --- Begin Message ---
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>
>
> Subject: 
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> Re: bug#4392: (Regexp Functions): The PAREN argument to `regexp-opt'	can be `symbols'.
>
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>
>
> Date: 
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> Sat, 09 Jul 2011 14:49:16 -0400
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> User-agent: 
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> Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)
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> Version: 24.1
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> There seems no point keeping this report open. A SYMBOLS
> option was added 2010-10-07, despire the following:
>
> Stefan Monnier wrote:
>
> > As the person responsible for adding the `words' value to PAREN, I'm
> > going to reject this request.  I think the `words' value was itself
> > a mistake.  It's just as easy to add (concat "\\<" ... "\\>") around the
> > call to regexp-opt.  Actually, the whole `paren' argument should
> > disappear (i.e. be hardcoded to "\\(?:").
>
>
> --- End Message ---