sed bug: sed cannot handle some chinese characters

[Gang Chen]

Hi

I found a bug that sed cannot handle some chinese symbol characters.
For example, text file "foo" following content "，／123"
(the first two characters are symbol characters in GBK encoding)

Here's the HEX dump for foo
$ hexdump -Cv foo
00000000 a3 ac a3 af 31 32 33 0a |....123.|
00000008

while the sed "s/[^0-9]//g" cannot filter out those characters
$ sed "s/[^0-9]//g" foo | hexdump -Cv
00000000 a3 ac a3 af 31 32 33 0a |....123.|
00000008

$ sed "s/[0-9]//g" foo | hexdump -Cv
00000000 a3 ac a3 af 0a |.....|
00000005

$ sed --version
GNU sed version 4.1.5
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.

Note: This issue will only occurs in chinese locale (e.g. LC_ALL=zh_CN.gbk)

Gang Chen
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