gistfile1.diff

Index: twitvim.vim
===================================================================
--- twitvim.vim	(revision 339)
+++ twitvim.vim	(working copy)
@@ -2696,18 +2696,13 @@
 let s:URL_PROTOCOL_HTTPS = '\%([Hh][Tt][Tt][Pp][Ss]\)://'
 let s:URL_PROTOCOL_NON_HTTPS = '\%([Hh][Tt][Tt][Pp]\|[Ff][Tt][Pp]\)://'
 
-let s:URL_DOMAIN = '[^[:space:])/]\+'
-let s:URL_PATH_CHARS = '[^[:space:]()]'
+let s:URL_DOMAIN = '\a[a-zA-Z0-9_-]*\(\.[a-zA-Z0-9][a-zA-Z0-9_-]*\)*\(:\d+\)\{0,1}'
+let s:URL_PATH_CHARS = '[a-zA-Z0-9_/.\-+%#?&=;@$,!''*~]'
 
 " URL paths may contain balanced parentheses.
 let s:URL_PARENS = '('.s:URL_PATH_CHARS.'*)'
+let s:URL_PATH = '\%('.s:URL_PATH_CHARS.'*\%('.s:URL_PARENS.s:URL_PATH_CHARS.'*\)*\)\|\%('.s:URL_PATH_CHARS.'\+\)'
 
-" Avoid swallowing up certain punctuation characters after a URL but allow a
-" URL to end with a balanced parenthesis.
-let s:URL_PATH_END = '\%([^[:space:]\.,;:()]\|'.s:URL_PARENS.'\)'
-
-let s:URL_PATH = '\%('.s:URL_PATH_CHARS.'*\%('.s:URL_PARENS.s:URL_PATH_CHARS.'*\)*'.s:URL_PATH_END.'\)\|\%('.s:URL_PATH_CHARS.'\+\)'
-
 " Bring it all together. Use this regex to match a URL.
 let s:URLMATCH = s:URL_PROTOCOL.s:URL_DOMAIN.'\%(/\%('.s:URL_PATH.'\)\=\)\='
 let s:URLMATCH_HTTPS = s:URL_PROTOCOL_HTTPS.s:URL_DOMAIN.'\%(/\%('.s:URL_PATH.'\)\=\)\='
@@ -2724,7 +2719,7 @@
     " Handle @-replies by showing that user's timeline.
     " An @-reply must be preceded by a non-word character and ends at a
     " non-word character.
-    let matchres = matchlist(s, '\w\@<!@\(\w\+\)')
+    let matchres = matchlist(s, '[\w]\@<!@\(\w\+\)')
     if matchres != []
         call s:get_timeline("user", matchres[1], 1, 0)
         return
@@ -2985,7 +2980,7 @@
 
         " An @-reply must be preceded by a non-word character and ends at a
         " non-word character.
-        syntax match twitterReply "\w\@<!@\w\+"
+        syntax match twitterReply "[\w]\@<!@\w\+"
 
         " A #-hashtag must be preceded by a non-word character and ends at a
         " non-word character.

This broken syntax shows with following text:

.. “@mattn_jp: “Big Sky :: mruby から正規表現が消え、正規表現がやってきた。” http://htn.to/9puex1” 

What encoding do you use?
The second problem doesn't show up in utf-8.

I don't think [\w] does what you think it does. It matches only \ and w. Better question would be what is coming before @ in that encoding you are using? FYI, it looked fine in euc-jp too.

What encoding do you use?
The second problem doesn't show up in utf-8.

CP932 but this problem occur on UTF-8 also.

At the first, are you ok about URL issue? Currently, you have question only for \w?

CP932 is DBCS(double byte character set). And the trail-byte of CP932 is possible to contains ASCII range. For example, “ on CP932 is 0x81 0x67.

I checked in some changes to tighten up URL recognition a bit because the first problem happens in UTF-8 too.

I do not see the "@name problem under UTF-8, so it's just cp932.

In UTF-8:

CP932 is store two bytes like below

leading byte: 0xa0 - 0xfe
trailing byte: 0x20 - 0x7e

So you can't use \w for \@<!, But I think this is vim's bug.
But you shouldn't use [^[:space:]] for URL path.

Ah, This all of issue causes vim's bug. Below is a patch. I'll send this patch to vim-dev after some checking.

diff -r 8b86b69546a9 src/regexp.c
--- a/src/regexp.c  Wed Feb 20 21:26:00 2013 +0100
+++ b/src/regexp.c  Fri Feb 22 10:40:23 2013 +0900
@@ -5449,7 +5449,19 @@
            }
            }
            else
-           --rp->rs_un.regsave.rs_u.pos.col;
+           {
+#ifdef FEAT_MBYTE
+           if (has_mbyte)
+           {
+               int off = (*mb_head_off)(regline,
+                 regline +
+                 rp->rs_un.regsave.rs_u.pos.col - 1) + 1;
+               rp->rs_un.regsave.rs_u.pos.col -= off;
+           }
+           else
+#endif
+               --rp->rs_un.regsave.rs_u.pos.col;
+           }
        }
        else
        {