Tweak regex

Author: tpope

autoload/rails.vim

@@ -961,7 +961,7 @@ function! s:BufCommands()
   if RailsFilePath() =~ '\<app/views/'
     " TODO: complete controller names with trailing slashes here
     command! -buffer -bar -bang -nargs=? -range -complete=customlist,s:controllerList Rextract :<line1>,<line2>call s:Extract(<bang>0,<f-args>)
-  elseif rails#buffer().name() =~# '^app/helpers/.*.rb$'
+  elseif rails#buffer().name() =~# '^app/helpers/.*\.rb$'
     command! -buffer -bar -bang -nargs=1 -range Rextract :<line1>,<line2>call s:RubyExtract(<bang>0, 'app/helpers', [], s:sub(<f-args>, '_helper$|Helper$|$', '_helper'))
   elseif rails#buffer().name() =~# '^app/\w\+/.*\.rb$'
     command! -buffer -bar -bang -nargs=1 -range Rextract :<line1>,<line2>call s:RubyExtract(<bang>0, matchstr(rails#buffer().name(), '^app/\w\+/').'concerns', ['  extend ActiveSupport::Concern', ''], <f-args>)