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Re: regex and case-fold-search problem

From: Kai Großjohann
Subject: Re: regex and case-fold-search problem
Date: Sat, 24 Aug 2002 12:40:01 +0200
User-agent: Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.3.50 (i686-pc-linux-gnu)

"Stefan Monnier" <monnier+gnu/address@hidden> writes:

> For ASCII it's pretty easy to fix.  But for other charsets, it's
> indeed more tricky.  Maybe we can simply use the smallest contiguous
> range of chars that includes all the chars we should match,
> so the behavior is indeed "implementation-defined" (in the sense
> that it's not necessarily obvious to the user what happens) but
> it's at least less confusing (in the sense that (case-fold-search t)
> matches at least as much as (case-fold-search nil)).

My first intuition would be to take all the characters in the range
[A-_] (preserving case), then to "double" each character that has an
uppercase and a lowercase variant.

So we are talking about the characters "ABCDEFGHIJKLMNOPQRSTXYZ[\]^_"
for the given range, and now we make a case-insensitive variant of
this list of characters.

Does this make sense?  Is it feasible to implement?

A large number of young women don't trust men with beards.  (BFBS Radio)

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