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List:       vim
Subject:    Re: multibyte in patterns
From:       Benji Fisher <benji () member ! AMS ! org>
Date:       2002-12-31 20:19:34
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Bram Moolenaar wrote:
> Benji Fisher wrote:
> 
> 
>>      More multi-byte woes.  If 'encoding' is set to utf-8, then a MB 
>>character does not match itself!
>>
>>:let foo = "\xab"
>>:set enc?
>>   encoding=latin1
>>:echo foo =~ foo
>>1
>>:set enc=utf8
>>:set enc?
>>   encoding=utf-8
>>:echo foo =~ foo
>>0
>>
>>Is this expected, or is it a bug?  Is there a work-around?  Am I 
>>supposed to do this?
>>
>>:echo iconv(foo, 'latin1', &enc) =~ foo
>>1
> 
> Changing 'encoding' makes multi-byte characters in registers and
> variables invalid.  Although you would still expect "foo =~ foo" to
> work.  The reason it doesn't is that the 0xab byte is an invalid
> character, it doesn't match anything.

      Thanks for the reply.  This has been bothering me for a while, and 
I do not think anyone else can help with it.

      The problem is not caused by changing 'encoding' after assigning 
the variable.  I can try

	:set encoding?
	utf-8
	:let foo = "\xab"
	:echo foo =~ foo
	0

      I would like to have a script insert a character like the one 
given by the digraph "<C-K><<".  According to "ga" (Normal mode) this 
character has code 0xab , so I try

	:let foo = "\xab"
	:put=foo

and this inserts a single character that looks like "<ab>".  Then I try

	:let foo = iconv("\xab", "latin1", &enc)
	:put=foo

and I get the "<<" digraph.  Strangely, "ga" tells me these are both 
"Hex 00ab".

      Are the tricks with iconv() supposed to work?  Is there a simpler way?

					--Benji Fisher

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