diff --git a/Library/Homebrew/formula_auditor.rb b/Library/Homebrew/formula_auditor.rb
index 7039f72ac8..1c668c98b7 100644
--- a/Library/Homebrew/formula_auditor.rb
+++ b/Library/Homebrew/formula_auditor.rb
@@ -790,7 +790,7 @@ module Homebrew
 
         tag = SharedAudits.gitlab_tag_from_url(url)
         tag ||= stable.specs[:tag]
-        tag ||= stable.version
+        tag ||= stable.version.to_s
 
         if @online
           error = SharedAudits.gitlab_release(owner, repo, tag, formula:)
diff --git a/Library/Homebrew/test/utils/shared_audits_spec.rb b/Library/Homebrew/test/utils/shared_audits_spec.rb
new file mode 100644
index 0000000000..819536c355
--- /dev/null
+++ b/Library/Homebrew/test/utils/shared_audits_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require "utils/shared_audits"
+
+RSpec.describe SharedAudits do
+  describe "::gitlab_tag_from_url" do
+    it "doesn't find tags in invalid urls" do
+      url = "https://gitlab.com/a/-/archive/v1.2.3/a-v1.2.3.tar.gz"
+      expect(described_class.gitlab_tag_from_url(url)).to be_nil
+    end
+
+    it "finds tags in basic urls" do
+      url = "https://gitlab.com/a/b/-/archive/v1.2.3/b-1.2.3.tar.gz"
+      expect(described_class.gitlab_tag_from_url(url)).to eq("v1.2.3")
+    end
+
+    it "finds tags in urls with subgroups" do
+      url = "https://gitlab.com/a/b/c/d/e/f/g/-/archive/2.5/g-2.5.tar.gz"
+      expect(described_class.gitlab_tag_from_url(url)).to eq("2.5")
+    end
+
+    it "finds tags in urls with special characters" do
+      url = "https://gitlab.com/a.b/c-d_e/-/archive/2.5/c-d_e-2.5.tar.gz"
+      expect(described_class.gitlab_tag_from_url(url)).to eq("2.5")
+    end
+  end
+end
diff --git a/Library/Homebrew/utils/shared_audits.rb b/Library/Homebrew/utils/shared_audits.rb
index f6a4b9b420..ff11c429eb 100644
--- a/Library/Homebrew/utils/shared_audits.rb
+++ b/Library/Homebrew/utils/shared_audits.rb
@@ -197,9 +197,6 @@ module SharedAudits
 
   sig { params(url: String).returns(T.nilable(String)) }
   def self.gitlab_tag_from_url(url)
-    url = url.to_s
-    url.match(%r{^https://gitlab\.com/[\w-]+/[\w-]+/-/archive/([^/]+)/})
-       .to_a
-       .second
+    url[%r{^https://gitlab\.com/(?:\w[\w.-]*/){2,}-/archive/([^/]+)/}, 1]
   end
 end