Add a function for getting matches, and use it to simplify a lot of code

ale_linters/ruby/rubocop.vim

@@ -9,18 +9,11 @@ function! ale_linters#ruby#rubocop#Handle(buffer, lines) abort
     let l:pattern = '\v:(\d+):(\d+): (.): (.+)'
     let l:output = []
 
-    for l:line in a:lines
-        let l:match = matchlist(l:line, l:pattern)
-
-        if len(l:match) == 0
-            continue
-        endif
-
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
         let l:text = l:match[4]
         let l:type = l:match[3]
 
         call add(l:output, {
-        \   'bufnr': a:buffer,
         \   'lnum': l:match[1] + 0,
         \   'col': l:match[2] + 0,
         \   'text': l:text,

ale_linters/ruby/ruby.vim

@@ -19,7 +19,6 @@ function! ale_linters#ruby#ruby#Handle(buffer, lines) abort
             endif
         else
             call add(l:output, {
-            \   'bufnr': a:buffer,
             \   'lnum': l:match[1] + 0,
             \   'col': 0,
             \   'text': l:match[2] . l:match[3],