replace multiple patterns by a single one

after/plugin/indentLine.vim

@@ -72,9 +72,7 @@ function! s:SetIndentLine()
         endif
 
         let pattern = line('$') < g:indentLine_maxLines ? 'v' : 'c'
-        for i in range(space+1, space * g:indentLine_indentLevel + 1, space)
-            execute 'syntax match IndentLine /\%(^\s\+\)\@<=\%' . i . pattern . ' / containedin=ALL conceal cchar=' . g:indentLine_char
-        endfor
+        exec 'syn match IndentLine /\%(^\)\@! \{'.(space-1).'}\zs / containedin=ALL contained conceal cchar=' . g:indentLine_char
     endif
 endfunction