enh(perl) fix false-positive variable match at end of string

CHANGES.md

@@ -2,6 +2,7 @@
 
 Core Grammars:
 
+- enh(perl) fix false-positive variable match at end of string
 - fix(cpp) not all kinds of number literals are highlighted correctly [Lê Duy Quang][]
 - fix(css) fix overly greedy pseudo class matching [Bradley Mackey][]
 - enh(arcade) updated to ArcGIS Arcade version 1.24 [Kristian Ekenes][]
@@ -22,6 +23,7 @@ Developer Tool:
 - enh(tools): order CSS options picklist [David Schach][]
 - enh(tools): remove duplicate CSS options [David Schach][]
 
+[Josh Goebel]: https://github.com/joshgoebel
 [Lê Duy Quang]: https://github.com/leduyquang753
 [Mohamed Ali]: https://github.com/MohamedAli00949
 [Bradley Mackey]: https://github.com/bradleymackey

src/languages/perl.js

@@ -270,15 +270,15 @@ export default function(hljs) {
     variants: [
       { begin: /\$\d/ },
       { begin: regex.concat(
-        /[$%@](\^\w\b|#\w+(::\w+)*|\{\w+\}|\w+(::\w*)*)/,
+        /[$%@](?!")(\^\w\b|#\w+(::\w+)*|\{\w+\}|\w+(::\w*)*)/,
         // negative look-ahead tries to avoid matching patterns that are not
         // Perl at all like $ident$, @ident@, etc.
         `(?![A-Za-z])(?![@$%])`
         )
       },
       {
         // Only $= is a special Perl variable and one can't declare @= or %=.
-        begin: /[$%@][^\s\w{=]|\$=/,
+        begin: /[$%@](?!")[^\s\w{=]|\$=/,
         relevance: 0
       }
     ],