Clearer regex

lib/linguist/strategy/modeline.rb

@@ -23,8 +23,20 @@ module Linguist
       #
       # Returns a String or nil
       def self.modeline(data)
-        data.lines.first(5).any? { |l| l.match(/\W(?:filetype=|ft=|-\*- mode:|-\*-)\s*(\w+)/) }
+        pattern =  %q{(?:
-        lang = $1
+                        (-\*- \s* (?:mode:)? \s*) |                  # $1: Emacs
+                        (\/\* \s* vim: \s* set \s* (?:ft|filetype)=) # $2: Vim
+                      )
+                      (\w+)                                          # $3: language
+                      (?:
+                        (?(1)                                        # If $1 matched...
+                          ;?\s* -\*- |                               # then close Emacs syntax
+                          : \s* \*\/                                 # otherwise close Vim syntax
+                        )
+                      )}
+
+        data.lines.first(5).any? { |l| l.match(/#{pattern}/x) }
+        lang = $3
       end
     end
   end