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Dash in regexp character classes: Beginnig vs. end [was: Use the charact
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address@hidden |
Subject: |
Dash in regexp character classes: Beginnig vs. end [was: Use the characters "+" and "-" in regular expressions] |
Date: |
Thu, 20 May 2021 09:15:29 +0200 |
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Mutt/1.5.21 (2010-09-15) |
On Wed, May 19, 2021 at 09:59:11PM +0000, Drew Adams wrote:
> > Hm. According to the docs, the dash should go last, but
> > a test actually confirms that it works in first position.
>
> I quoted this from (elisp) `Regexp Special':
>
> To include a ‘-’, write ‘-’ as the first or last
> ^^^^^^^^^^^^^
> character of the character alternative, or as the
> upper bound of a range. Thus, ‘[]-]’ matches both
> ‘]’ and ‘-’.
>
> That's from Emacs 26 (and all prior releases, at least
> as far back as Emacs 20). But yes, they changed that
> text for Emacs 27, to this:
>
> To include ‘-’, put it at the end.
> ^^^^^^^^^^
> ___
>
> For Emacs 20, it says this:
>
> To include a `-', write `-' as the first or last
> character of the character alternative, or put it
> after a range. Thus, `[]-]' matches both `]' and
> `-'.
Oh. That is interesting. Anyone knows why that change?
Cheers
- t
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- Re: [External] : Use the characters "+" and "-" in regular expressions, (continued)
- Re: [External] : Use the characters "+" and "-" in regular expressions, Jean Louis, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, Jean Louis, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, Yuri Khan, 2021/05/20
- [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, Eduardo Ochs, 2021/05/20
- RE: [External] : Use the characters "+" and "-" in regular expressions, Drew Adams, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, Jean Louis, 2021/05/21
- Re: [External] : Use the characters "+" and "-" in regular expressions, Jean Louis, 2021/05/20
- Dash in regexp character classes: Beginnig vs. end [was: Use the characters "+" and "-" in regular expressions],
address@hidden <=
- Re: Dash in regexp character classes: Beginnig vs. end [was: Use the characters "+" and "-" in regular expressions], Robert Pluim, 2021/05/20
- RE: [External] : Re: Use the characters "+" and "-" in regular expressions, Drew Adams, 2021/05/19
- RE: [External] : Re: Use the characters "+" and "-" in regular expressions, Drew Adams, 2021/05/19
Re: Use the characters "+" and "-" in regular expressions, tomas, 2021/05/19
RE: [External] : Use the characters "+" and "-" in regular expressions, Drew Adams, 2021/05/19