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

ale_linters/perl/perl.vim

@@ -21,19 +21,12 @@ function! ale_linters#perl#perl#Handle(buffer, lines) abort
     let l:pattern = '\(.\+\) at \(.\+\) line \(\d\+\)'
     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:line = l:match[3]
         let l:text = l:match[1]
         let l:type = 'E'
 
         call add(l:output, {
-        \   'bufnr': a:buffer,
         \   'lnum': l:line,
         \   'text': l:text,
         \   'type': l:type,