Feature: Syntax typeface delimiters can end at punctuation

autoload/vimwiki/base.vim

@@ -697,19 +697,6 @@ function! vimwiki#base#get_anchors(filename, syntax) abort
 endfunction
 
 
-" Helper to mutualize
-" Called: normalize and unnormalize anchor
-function! s:get_punctuaction_regex() abort
-  " From: https://gist.github.com/asabaylus/3071099#gistcomment-2563127
-  if v:version <= 703
-    " Retrocompatibility: Get invalid range for vim 7.03
-    return '[^0-9a-zA-Z_ \-]'
-  else
-    return '[^0-9a-zA-Z\u4e00-\u9fff_ \-]'
-  endif
-endfunction
-
-
 " :param: anchor <string> <= Heading line
 " :param: (1) previous_anchors <dic[IN/OUT]> of previous normalized anchor
 " -- to know if must append -2, updated on the fly
@@ -735,7 +722,7 @@ function! vimwiki#base#normalize_anchor(anchor, ...) abort
   let anchor = tolower(anchor)
 
   " 2 Remove anything that is not a letter, number, CJK character, hyphen or space
-  let punctuation_rx = s:get_punctuaction_regex()
+  let punctuation_rx = vimwiki#u#get_punctuation_regex()
   let anchor = substitute(anchor, punctuation_rx, '', 'g')
 
   " 3 Change any space to a hyphen
@@ -777,7 +764,7 @@ function! vimwiki#base#unnormalize_anchor(anchor) abort
     return [anchor, 1, '']
   endif
 
-  let punctuation_rx = s:get_punctuaction_regex()
+  let punctuation_rx = vimwiki#u#get_punctuation_regex()
   " Permit url part of link: '](www.i.did.it.my.way.cl)'
   let link_rx = '\%(\]([^)]*)\)'
   let invisible_rx =  '\%( \|-\|' . punctuation_rx . '\|' . link_rx . '\)'

autoload/vimwiki/u.vim

@@ -271,14 +271,40 @@ function! vimwiki#u#get_syntax_dic(...) abort
 endfunction
 
 
+" Helper to mutualize
+" Called: normalize and unnormalize anchor
+function! vimwiki#u#get_punctuation_regex() abort
+  " From: https://gist.github.com/asabaylus/3071099#gistcomment-2563127
+  " Faster
+  " Unused now
+  if v:version <= 703
+    " Retrocompatibility: Get invalid range for vim 7.03
+    return '[^0-9a-zA-Z_ \-]'
+  else
+    return '[^0-9a-zA-Z\u4e00-\u9fff_ \-]'
+  endif
+endfunction
+
+
+" Faster
+function! vimwiki#u#get_punctuation_string() abort
+  " See: https://github.github.com/gfm/#ascii-punctuation-character
+  return '!"#$%&''()*+,-./:;<=>?@\[\\\]^`{}|~'
+endfunction
+
+
 " Helper: Expand regex from reduced typeface delimiters
 " :param: list<list,delimiters>> with reduced regex
 " Return: list with extended regex delimiters (not inside a word)
 "   -- [['\*_', '_\*']] -> [['\*_\S\@=', '\S\@<=_\*\%(\s\|$\)\@=']]
+" See: https://github.github.com/gfm/#left-flanking-delimiter-run
 function! vimwiki#u#hi_expand_regex(lst) abort
   let res = []
+  let p = vimwiki#u#get_punctuation_string()
   for delimiters in a:lst
-    call add(res, [delimiters[0] . '\S\@=', '\S\@<=' . delimiters[1] . '\%(\s\|\n\)\@='])
+    call add(res, [
+          \ delimiters[0] . '\S\@=',
+          \ '\S\@<=' . delimiters[1] . '\%(\_[[:space:]' . p . ']\)\@='])
   endfor
   return res
 endfunction