RE: UTF-8 and Regular Expressions

[Romano Giannetti <romanol@xxxxxxx>]

My 0.02€ here:

On Wed, 2007-04-18 at 09:19 +0200, G. Milde wrote:
> I do have the impression, that it would be quite surprising
> if re_search_forward did in UTF-8 mode pattern "f..r" did match "för"
> (with ö == U+00F6 LATIN SMALL LETTER O WITH DIAERESIS) and a pattern
> "f[oö]r" were invalid (or not matching "för").

I completely agree with this statement... it bit me a couple of week
ago, and I am almost inclined to call it a bug. In jed 0.99.18U, if I
re_search_forward with a pattern "e.e", "eñe" is not matched. If I
search with "e..e", "eñe" IS matched, but the highlighted zone extends
one space left after the final "e". That's quite confusing.

By the way, I discovered that in this same version, if you load
"iso-latin1.sl" when in utf-8 mode, dabbrev stops working (it say
something like "invalid utf-8 sequence" every time you call it). Just a
note so that hapeless people like me can find it googling away...

On Wed, 2007-04-18 at 17:18 +0200, SANGOI DINO LEONARDO wrote:
> Anyways, I use regular expression a lot, and I don't remember ever
> needing or having a problem because of missing utf-8 support.
> 
> But probably I'm not a good test case: in Italian we have very few
> characters outside the ASCII (7 bit) set. 

I can understand, being myself Italian too; but living in Spain and
writing often in Spanish (where ñ and accented chars are much more
common and much more important than in Italian) I noticed it more. 
On the other hand, it's true too that I use re_* mainly when
programming, in pure ASCII, so the problem is effectively quite rare. 

Romano



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