1 files changed, 12 insertions, 1 deletions
diff --git a/spec/ruby/core/matchdata/regexp_spec.rb b/spec/ruby/core/matchdata/regexp_spec.rb
index 05a8e80567..7dcb0e62db 100644
--- a/spec/ruby/core/matchdata/regexp_spec.rb
+++ b/spec/ruby/core/matchdata/regexp_spec.rb
@@ -3,11 +3,22 @@ require_relative '../../spec_helper'
 describe "MatchData#regexp" do
   it "returns a Regexp object" do
     m = 'haystack'.match(/hay/)
-    m.regexp.should be_an_instance_of(Regexp)
+    m.regexp.should.instance_of?(Regexp)
   end
 
   it "returns the pattern used in the match" do
     m = 'haystack'.match(/hay/)
     m.regexp.should == /hay/
   end
+
+  it "returns the same Regexp used to match" do
+    r = /hay/
+    m = 'haystack'.match(r)
+    m.regexp.object_id.should == r.object_id
+  end
+
+  it "returns a Regexp for the result of gsub(String)" do
+    'he[[o'.gsub('[', ']')
+    $~.regexp.should == /\[/
+  end
 end