Simplify some regexes

autoload/vimwiki/lst.vim

@@ -376,10 +376,10 @@ endfunction "}}}
 "If there is no second argument, 0 is returned at a header, otherwise the
 "header is skipped
 function! s:get_next_line(lnum, ...) "{{{
-  if getline(a:lnum) =~# '^\s*'.g:vimwiki_rxPreStart
+  if getline(a:lnum) =~# g:vimwiki_rxPreStart
     let cur_ln = a:lnum + 1
     while cur_ln <= line('$') &&
-          \ getline(cur_ln) !~# '^\s*'.g:vimwiki_rxPreEnd.'\s*$'
+          \ getline(cur_ln) !~# g:vimwiki_rxPreEnd
       let cur_ln += 1
     endwhile
     let next_line = cur_ln
@@ -404,10 +404,10 @@ endfunction "}}}
 function! s:get_prev_line(lnum) "{{{
   let prev_line = prevnonblank(a:lnum-1)
 
-  if getline(prev_line) =~# '^\s*'.g:vimwiki_rxPreEnd.'\s*$'
+  if getline(prev_line) =~# g:vimwiki_rxPreEnd
     let cur_ln = a:lnum - 1
     while 1
-      if cur_ln == 0 || getline(cur_ln) =~# '^\s*'.g:vimwiki_rxPreStart
+      if cur_ln == 0 || getline(cur_ln) =~# g:vimwiki_rxPreStart
         break
       endif
       let cur_ln -= 1

ftplugin/vimwiki.vim

@@ -173,9 +173,9 @@ function! VimwikiFoldLevel(lnum) "{{{
   if line =~# g:vimwiki_rxHeader
     return '>'.vimwiki#u#count_first_sym(line)
   " Code block folding...
-  elseif line =~# '^\s*'.g:vimwiki_rxPreStart
+  elseif line =~# g:vimwiki_rxPreStart
     return 'a1'
-  elseif line =~# '^\s*'.g:vimwiki_rxPreEnd.'\s*$'
+  elseif line =~# g:vimwiki_rxPreEnd
     return 's1'
   else
     return "="
@@ -221,7 +221,7 @@ function! VimwikiFoldText() "{{{
   let main_text = substitute(line, '^\s*', repeat(' ',indent(v:foldstart)), '')
   let fold_len = v:foldend - v:foldstart + 1
   let len_text = ' ['.fold_len.'] '
-  if line !~# '^\s*'.g:vimwiki_rxPreStart
+  if line !~# g:vimwiki_rxPreStart
     let [main_text, spare_len] = s:shorten_text(main_text, 50)
     return main_text.len_text
   else

syntax/vimwiki.vim

@@ -315,6 +315,12 @@ endfor
 
 " }}}
 
+let g:vimwiki_rxPreStart = '^\s*'.g:vimwiki_rxPreStart
+let g:vimwiki_rxPreEnd = '^\s*'.g:vimwiki_rxPreEnd.'\s*$'
+
+let g:vimwiki_rxMathStart = '^\s*'.g:vimwiki_rxMathStart
+let g:vimwiki_rxMathEnd = '^\s*'.g:vimwiki_rxMathEnd.'\s*$'
+
 " possibly concealed chars " {{{
 let s:conceal = exists("+conceallevel") ? ' conceal' : ''
 
@@ -444,11 +450,11 @@ execute 'syntax match VimwikiCodeT /'.g:vimwiki_rxCode.'/ contained contains=Vim
 " <hr> horizontal rule
 execute 'syntax match VimwikiHR /'.g:vimwiki_rxHR.'/'
 
-execute 'syntax region VimwikiPre start=/^\s*'.g:vimwiki_rxPreStart.
-      \ '/ end=/^\s*'.g:vimwiki_rxPreEnd.'\s*$/ contains=@Spell'
+execute 'syntax region VimwikiPre start=/'.g:vimwiki_rxPreStart.
+      \ '/ end=/'.g:vimwiki_rxPreEnd.'/ contains=@Spell'
 
-execute 'syntax region VimwikiMath start=/^\s*'.g:vimwiki_rxMathStart.
-      \ '/ end=/^\s*'.g:vimwiki_rxMathEnd.'\s*$/ contains=@Spell'
+execute 'syntax region VimwikiMath start=/'.g:vimwiki_rxMathStart.
+      \ '/ end=/'.g:vimwiki_rxMathEnd.'/ contains=@Spell'
 
 
 " placeholders
@@ -594,16 +600,16 @@ endif
 if !empty(s:nested)
   for [s:hl_syntax, s:vim_syntax] in items(s:nested)
     call vimwiki#base#nested_syntax(s:vim_syntax,
-          \ '^\s*'.g:vimwiki_rxPreStart.'\%(.*[[:blank:][:punct:]]\)\?'.
+          \ g:vimwiki_rxPreStart.'\%(.*[[:blank:][:punct:]]\)\?'.
           \ s:hl_syntax.'\%([[:blank:][:punct:]].*\)\?',
-          \ '^\s*'.g:vimwiki_rxPreEnd, 'VimwikiPre')
+          \ g:vimwiki_rxPreEnd, 'VimwikiPre')
   endfor
 endif
 " LaTeX
 call vimwiki#base#nested_syntax('tex', 
-      \ '^\s*'.g:vimwiki_rxMathStart.'\%(.*[[:blank:][:punct:]]\)\?'.
+      \ g:vimwiki_rxMathStart.'\%(.*[[:blank:][:punct:]]\)\?'.
       \ '\%([[:blank:][:punct:]].*\)\?',
-      \ '^\s*'.g:vimwiki_rxMathEnd, 'VimwikiMath')
+      \ g:vimwiki_rxMathEnd, 'VimwikiMath')
 "}}}