3 files changed, 53 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index f933741bec..5572ee6162 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Mar  6 16:24:01 2012  Nobuyoshi Nakada  <[email protected]>
+
+	* parse.y (parser_tokadd_string): escape simple regexp meta
+	  character termninators.
+
 Tue Mar  6 10:11:43 2012  Nobuyoshi Nakada  <[email protected]>
 
 	* ext/io/console/console.c (set_rawmode): clear ECHOE and ECHOK
diff --git a/parse.y b/parse.y
index 4796e7453c..252860bc7e 100644
--- a/parse.y
+++ b/parse.y
@@ -6440,6 +6440,18 @@ parser_tokadd_mbchar(struct parser_params *parser, int c)
 
 #define tokadd_mbchar(c) parser_tokadd_mbchar(parser, (c))
 
+static inline int
+simple_re_meta(int c)
+{
+    switch (c) {
+      case '$': case '*': case '+': case '.':
+      case '?': case '^': case '|':
+	return TRUE;
+      default:
+	return FALSE;
+    }
+}
+
 static int
 parser_tokadd_string(struct parser_params *parser,
 		     int func, int term, int paren, long *nest,
@@ -6520,7 +6532,7 @@ parser_tokadd_string(struct parser_params *parser,
 		    goto non_ascii;
 		}
 		if (func & STR_FUNC_REGEXP) {
-		    if (c == term) {
+		    if (c == term && !simple_re_meta(c)) {
 			tokadd(c);
 			continue;
 		    }
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 95dbb2b9d3..7e31e99aa7 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -1,5 +1,5 @@
 require 'test/unit'
-require_relative 'envutil'
+require 'envutil'
 
 class TestRegexp < Test::Unit::TestCase
   def setup
@@ -161,6 +161,40 @@ class TestRegexp < Test::Unit::TestCase
     assert_equal(':', %r:\::.source, bug5484)
   end
 
+  def test_source_escaped
+    expected, result = "$*+.?^|".each_char.map {|c|
+      [
+        ["\\#{c}", "\\#{c}", 1],
+        begin
+          re = eval("%r#{c}\\#{c}#{c}", nil, __FILE__, __LINE__)
+          t = eval("/\\#{c}/", nil, __FILE__, __LINE__).source
+        rescue SyntaxError => e
+          [e, t, nil]
+        else
+          [re.source, t, re =~ "a#{c}a"]
+        end
+      ]
+    }.transpose
+    assert_equal(expected, result)
+  end
+
+  def test_source_unescaped
+    expected, result = "!\"#%&',-/:;=@_`~".each_char.map {|c|
+      [
+        ["#{c}", "\\#{c}", 1],
+        begin
+          re = eval("%r#{c}\\#{c}#{c}", nil, __FILE__, __LINE__)
+          t = eval("%r{\\#{c}}", nil, __FILE__, __LINE__).source
+        rescue SyntaxError => e
+          [e, t, nil]
+        else
+          [re.source, t, re =~ "a#{c}a"]
+        end
+      ]
+    }.transpose
+    assert_equal(expected, result)
+  end
+
   def test_inspect
     assert_equal('//', //.inspect)
     assert_equal('//i', //i.inspect)