[Sass] [SCSS] Fix a bug in the parser that allowed for some numbers t…

…o be misrecognized and also caused performance issues in some rare cases.

lib/sass/scss/rx.rb

@@ -63,7 +63,7 @@ def self.quote(str, flags = 0)
 
       IDENT    = /-?#{NMSTART}#{NMCHAR}*/
       NAME     = /#{NMCHAR}+/
-      NUM      = /[0-9]+|[0-9]*.[0-9]+/
+      NUM      = /[0-9]+|[0-9]*\.[0-9]+/
       STRING   = /#{STRING1}|#{STRING2}/
       URLCHAR  = /[#%&*-~]|#{NONASCII}|#{ESCAPE}/
       URL      = /(#{URLCHAR}*)/