* lisp/progmodes/ruby-mode.el (ruby-syntax-propertize-function): Only

propertize regexp when not inside a string.

Fixes: debbugs:13885

2 files changed, 9 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 18242539cca..cef47715dc0 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-06  Dmitry Gutov  <dgutov@yandex.ru>
+
+        * progmodes/ruby-mode.el (ruby-syntax-propertize-function): Only
+        propertize regexp when not inside a string (Bug#13885).
+
 2013-03-06  Alan Mackenzie  <acm@muc.de>
 
         Correct the position of point in some line-up functions.
diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 9b007c0063a..6e471d1aa2a 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -1276,8 +1276,10 @@ It will be properly highlighted even when the call omits parens."))
             "\\)\\s *"
             ;; The regular expression itself.
             "\\(/\\)[^/\n\\\\]*\\(?:\\\\.[^/\n\\\\]*\\)*\\(/\\)")
-           (2 (string-to-syntax "\"/"))
-           (3 (string-to-syntax "\"/")))
+           (3 (unless (nth 3 (syntax-ppss (match-beginning 2)))
+                (put-text-property (match-beginning 2) (match-end 2)
+                                   'syntax-table (string-to-syntax "\"/"))
+                (string-to-syntax "\"/"))))
           ("^=en\\(d\\)\\_>" (1 "!"))
           ("^\\(=\\)begin\\_>" (1 "!"))
           ;; Handle here documents.