From f1764623db38bd5773e741b038f36f9dcd3173f2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 8 Jul 2025 19:35:06 +0900
Subject: [PATCH] [ruby/uri] Make URI::regexp schemes case sensitive
 (https://github.com/ruby/uri/pull/38)

https://github.com/ruby/uri/commit/0c2b6468fa
---
 lib/uri/rfc2396_parser.rb | 2 +-
 test/uri/test_parser.rb   | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/uri/rfc2396_parser.rb b/lib/uri/rfc2396_parser.rb
index 75a2d2dbde..c6096c49e5 100644
--- a/lib/uri/rfc2396_parser.rb
+++ b/lib/uri/rfc2396_parser.rb
@@ -263,7 +263,7 @@ module URI
       unless schemes
         @regexp[:ABS_URI_REF]
       else
-        /(?=#{Regexp.union(*schemes)}:)#{@pattern[:X_ABS_URI]}/x
+        /(?=(?i:#{Regexp.union(*schemes).source}):)#{@pattern[:X_ABS_URI]}/x
       end
     end
 
diff --git a/test/uri/test_parser.rb b/test/uri/test_parser.rb
index 04c2cd39be..c14824f5e8 100644
--- a/test/uri/test_parser.rb
+++ b/test/uri/test_parser.rb
@@ -113,4 +113,12 @@ class URI::TestParser < Test::Unit::TestCase
       end
     end
   end
+
+  def test_rfc2822_make_regexp
+    parser = URI::RFC2396_Parser.new
+    regexp = parser.make_regexp("HTTP")
+    assert_match(regexp, "HTTP://EXAMPLE.COM/")
+    assert_match(regexp, "http://example.com/")
+    refute_match(regexp, "https://example.com/")
+  end
 end