From cbc22bf9bd0a84d00c76da72052a42e99a3e5d6e Mon Sep 17 00:00:00 2001
From: tadf <tadf@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 5 Aug 2007 04:06:08 +0000
Subject: [PATCH] added an assertion.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12872 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_regexp.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index dbfe4d7aeb..24ac731d8e 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -24,4 +24,8 @@ class TestRegexp < Test::Unit::TestCase
       Regexp.new(s, nil, "u")
     end
   end
+
+  def test_ruby_dev_31309
+    assert_equal('Ruby', 'Ruby'.sub(/[^a-z]/i, '-'))
+  end
 end