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

ale_linters/matlab/mlint.vim

@@ -22,13 +22,7 @@ function! ale_linters#matlab#mlint#Handle(buffer, lines) abort
     let l:pattern = '^L \(\d\+\) (C \([0-9-]\+\)): \([A-Z]\+\): \(.\+\)$'
     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:lnum = l:match[1] + 0
         let l:col = l:match[2] + 0
         let l:code = l:match[3]