Don't interpret autocomplete start string as regexp

autoload/vimwiki/base.vim

@@ -420,6 +420,7 @@ function! vimwiki#base#resolve_scheme(lnk, as_html) " {{{ Resolve scheme
       let path = VimwikiGet('path')
       let ext = VimwikiGet('ext')
     endif
+    let idx = g:vimwiki_current_idx
     let subdir = VimwikiGet('diary_rel_path')
   elseif scheme =~ 'local'
     " revisiting the 'lcd'-bug ...
@@ -674,6 +675,65 @@ function! vimwiki#base#get_links(pat) "{{{ return string-list for files
   return globlinks
 endfunction "}}}
 
+function! vimwiki#base#get_anchors(filename, syntax) "{{{
+  if !filereadable(a:filename)
+    return []
+  endif
+
+  let rxheader = g:vimwiki_{a:syntax}_header_search
+  let rxbold = g:vimwiki_{a:syntax}_bold_search
+
+  let anchor_level = ['', '', '', '', '', '', '']
+  let anchors = []
+  for line in readfile(a:filename)
+
+    " collect headers
+    let h_match = matchlist(line, rxheader)
+    if !empty(h_match)
+      let header = vimwiki#u#trim(h_match[2])
+      let level = len(h_match[1])
+      let anchor_level[level-1] = header
+      for l in range(level, 6)
+        let anchor_level[l] = ''
+      endfor
+      call add(anchors, header)
+      let complete_anchor = ''
+      for l in range(level-1)
+        if anchor_level[l] != ''
+          let complete_anchor .= anchor_level[l].'#'
+        endif
+      endfor
+      let complete_anchor .= header
+      call add(anchors, complete_anchor)
+    endif
+
+    " collect bold text (there can be several in one line)
+    let bold_count = 0
+    let bold_end = 0
+    while 1
+      let bold_text = matchstr(line, rxbold, bold_end, bold_count)
+      let bold_end = matchend(line, rxbold, bold_end, bold_count) + 1
+      if bold_text == ""
+        break
+      endif
+      call add(anchors, bold_text)
+      let anchor_level[6] = bold_text
+      let complete_anchor = ''
+      for l in range(6)
+        if anchor_level[l] != ''
+          let complete_anchor .= anchor_level[l].'#'
+        endif
+      endfor
+      let complete_anchor .= bold_text
+      call add(anchors, complete_anchor)
+      let bold_count += 1
+    endwhile
+
+  endfor
+
+  return anchors
+endfunction "}}}
+
 " s:jump_to_anchor
 function! s:jump_to_anchor(anchor) "{{{
   let oldpos = getpos('.')

ftplugin/vimwiki.vim

@@ -90,7 +90,7 @@ function! Complete_wikifiles(findstart, base)
         " get the filename relative to the wiki path:
         let subdir_filename = substitute(fnamemodify(wikifile, ':p:r'),
               \ '\V'.fnamemodify(directory, ':p'), '', '')
-        if subdir_filename =~ '^'.prefix
+        if subdir_filename =~ '^'.vimwiki#u#escape(prefix)
           call add(result, scheme . subdir_filename)
         endif
       endfor
@@ -103,70 +103,17 @@ function! Complete_wikifiles(findstart, base)
       let link_infos = vimwiki#base#resolve_scheme(segments[0].'#', 0)
       let wikifile = link_infos[6]
       let syntax = VimwikiGet('syntax', link_infos[0])
-      let rxheader = g:vimwiki_{syntax}_header_search
-      let rxbold = g:vimwiki_{syntax}_bold_search
-      if !filereadable(wikifile)
-        return []
-      endif
-      let filecontent = readfile(wikifile)
-      let anchor_level = ['', '', '', '', '', '', '']
-      let anchors = []
-
-      for line in filecontent
-
-        " collect headers
-        let h_match = matchlist(line, rxheader)
-        if !empty(h_match)
-          let header = vimwiki#u#trim(h_match[2])
-          let level = len(h_match[1])
-          let anchor_level[level-1] = header
-          for l in range(level, 6)
-            let anchor_level[l] = ''
-          endfor
-          call add(anchors, header)
-          let complete_anchor = ''
-          for l in range(level-1)
-            if anchor_level[l] != ''
-              let complete_anchor .= anchor_level[l].'#'
-            endif
-          endfor
-          let complete_anchor .= header
-          call add(anchors, complete_anchor)
-        endif
-
-        " collect bold text (there can be several in one line)
-        let bold_count = 0
-        let bold_end = 0
-        while 1
-          let bold_text = matchstr(line, rxbold, bold_end, bold_count)
-          let bold_end = matchend(line, rxbold, bold_end, bold_count) + 1
-          if bold_text == ""
-            break
-          endif
-          let anchor_level[6] = bold_text
-          call add(anchors, bold_text)
-          let complete_anchor = ''
-          for l in range(6)
-            if anchor_level[l] != ''
-              let complete_anchor .= anchor_level[l].'#'
-            endif
-          endfor
-          let complete_anchor .= bold_text
-          call add(anchors, complete_anchor)
-          let bold_count += 1
-        endwhile
-
-      endfor
+      let anchors = vimwiki#base#get_anchors(wikifile, syntax)
 
       let filtered_anchors = []
       let given_anchor = join(segments[1:], '#')
       for anchor in anchors
-        if anchor =~# '^'.given_anchor
+        if anchor =~# '^'.vimwiki#u#escape(given_anchor)
           call add(filtered_anchors, segments[0].'#'.anchor)
         endif
       endfor
-
       return filtered_anchors
+
     endif
   endif
 endfunction