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Re: category codes and regexps
From: |
Werner LEMBERG |
Subject: |
Re: category codes and regexps |
Date: |
Mon, 26 Jul 2004 04:05:51 +0200 (CEST) |
> > Assume that I want to check a buffer for characters which aren't Thai,
> > and which aren't in the range a-z. [...]
> Unfortunately [...] can't be used with category nor syntax.
>
> [ ^ a - z ESC : (insert (make-char 'thai-tis620 #x20)) RET
> - ESC : (insert (make-char 'thai-tis620 #x7f)) RET
> ]
>
> will produce a regex that you want.
>
> Another way is to make a new category (say, menumonic `T')
> that contains a-z and Thai. Then you can specify:
> \CT
Thanks for the quick reply. Both solutions are much uglier than
expected :-(
Wouldn't it be possible to extend the [...] syntax, say, to use the
already existing [:...:] character classes construct:
[^a-z[:\ct:]]
At first sight, I can't see a conflict.
Werner
PS: In elisp.info, the sentence
For the description of the known categories, type `M-x
describe-categories <RET>'.
is missing at the end of the description of `\cC' (in node `Regexp
Backslash'). In general, it would be useful to unify the regexp
descriptions of emacs.info and elisp.info.
Finally, the output of `describe-categories' is very crude and
probably causes some worries for the beginner. Maybe this can be
beautified, with some explanations at the beginning.