* Meaning of \C-? in bracket regular expression
@ 2015-09-27 23:49 Joe Riel
2015-09-28 0:11 ` Michael Heerdegen
0 siblings, 1 reply; 3+ messages in thread
From: Joe Riel @ 2015-09-27 23:49 UTC (permalink / raw)
To: Help GNU Emacs
What is the meaning of the elisp regular expression
"[^\C-?}]"
Specifically, the "\C-?". Is that a range?
Then what character is \C?
Or is it something else?
--
Joe Riel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Meaning of \C-? in bracket regular expression
2015-09-27 23:49 Meaning of \C-? in bracket regular expression Joe Riel
@ 2015-09-28 0:11 ` Michael Heerdegen
2015-09-28 4:51 ` Joe Riel
0 siblings, 1 reply; 3+ messages in thread
From: Michael Heerdegen @ 2015-09-28 0:11 UTC (permalink / raw)
To: help-gnu-emacs
Joe Riel <joer@san.rr.com> writes:
> "[^\C-?}]"
(info "(elisp) Ctl-Char Syntax") says that
For historical reasons, Emacs treats the <DEL> character as the
control equivalent of ‘?’:
?\^? ⇒ 127 ?\C-? ⇒ 127
Try (string-to-vector "[^\C-?}]").
So this is a question of string read syntax - there is no character "-"
in this string representing a regexp.
Michael.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Meaning of \C-? in bracket regular expression
2015-09-28 0:11 ` Michael Heerdegen
@ 2015-09-28 4:51 ` Joe Riel
0 siblings, 0 replies; 3+ messages in thread
From: Joe Riel @ 2015-09-28 4:51 UTC (permalink / raw)
To: Michael Heerdegen; +Cc: help-gnu-emacs
On Mon, 28 Sep 2015 02:11:04 +0200
Michael Heerdegen <michael_heerdegen@web.de> wrote:
> Joe Riel <joer@san.rr.com> writes:
>
> > "[^\C-?}]"
>
> (info "(elisp) Ctl-Char Syntax") says that
>
> For historical reasons, Emacs treats the <DEL> character as the
> control equivalent of ‘?’:
>
> ?\^? ⇒ 127 ?\C-? ⇒ 127
>
> Try (string-to-vector "[^\C-?}]").
>
> So this is a question of string read syntax - there is no character "-"
> in this string representing a regexp.
Thanks, that was helpful.
--
Joe Riel
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2015-09-27 23:49 Meaning of \C-? in bracket regular expression Joe Riel
2015-09-28 0:11 ` Michael Heerdegen
2015-09-28 4:51 ` Joe Riel
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