From bea03284ec08decdc5024228b1aadb82b16ab715 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Fri, 8 May 2026 14:12:01 -0700
Subject: Stack-allocate onig region for match

---
 test/ruby/test_regexp.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index b519872d67..805c57b472 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -1011,6 +1011,18 @@ class TestRegexp < Test::Unit::TestCase
     end;
   end
 
+  def test_regsub_no_memory_leak_many_captures
+    assert_no_memory_leak([], "#{<<~"begin;"}", "#{<<~"end;"}", rss: true)
+      code = proc do
+        "aaaaaaaaaaa".gsub(/(a)(b)?(c)?(d)?(e)?(f)?(g)?(h)?/, "")
+      end
+
+      1_000.times(&code)
+    begin;
+      100_000.times(&code)
+    end;
+  end
+
   def test_ignorecase
     v = assert_deprecated_warning(/variable \$= is no longer effective/) { $= }
     assert_equal(false, v)
-- 
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