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Re: RE: [External] : Use the characters "+" and "-" in regular expressi
From: |
steve-humphreys |
Subject: |
Re: RE: [External] : Use the characters "+" and "-" in regular expressions |
Date: |
Thu, 20 May 2021 08:26:39 +0200 |
Have done as follows but cannot see the result. Have read through
the table of valid format specifications, and the other options are
mostly about printing numbers.
(message " ")
(message "*** ***")
(setq s (string-match "[+]+" "++++++++++++++++"))
message("%s" s)
(setq s (string-match "[+-]+" "++++++++++++++++"))
message("%s" s)
(setq s (string-match "[+-]+" "----------------"))
message("%s" s)
> Sent: Thursday, May 20, 2021 at 9:59 AM
> From: "Drew Adams" <drew.adams@oracle.com>
> To: "tomas@tuxteam.de" <tomas@tuxteam.de>, "help-gnu-emacs@gnu.org"
> <help-gnu-emacs@gnu.org>
> Subject: RE: [External] : Re: Use the characters "+" and "-" in regular
> expressions
>
> > 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
> `-'.
>
- Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/19
- Re: Use the characters "+" and "-" in regular expressions, Skip Montanaro, 2021/05/19
- Re: Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/19
- Re: Use the characters "+" and "-" in regular expressions, Yuri Khan, 2021/05/19
- Re: Use the characters "+" and "-" in regular expressions, tomas, 2021/05/19
- RE: [External] : Re: Use the characters "+" and "-" in regular expressions, Drew Adams, 2021/05/19
- Re: RE: [External] : Use the characters "+" and "-" in regular expressions,
steve-humphreys <=
- [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, tomas, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 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, tomas, 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, tomas, 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, tomas, 2021/05/20
- Re: [External] : Use the characters "+" and "-" in regular expressions, steve-humphreys, 2021/05/20