205151-match trailing slash in GitLab-Flavored Markdown References

app/models/concerns/referable.rb

@@ -85,7 +85,7 @@ module Referable
           \/#{route.is_a?(Regexp) ? route : Regexp.escape(route)}
           \/#{pattern}
           (?<path>
-            (\/[a-z0-9_=-]+)*
+            (\/[a-z0-9_=-]+)*\/*
           )?
           (?<query>
             \?[a-z0-9_=-]+

changelogs/unreleased/issue_205151.yml

+title: 'Rendering trailing slash in reference links (issue 205151)'
+merge_request: 42484
+author:
+type: fixed

ee/app/models/ee/epic.rb

@@ -170,7 +170,7 @@ module EE
             \/-\/epics
             \/(?<epic>\d+)
             (?<path>
-              (\/[a-z0-9_=-]+)*
+              (\/[a-z0-9_=-]+)*\/*
             )?
             (?<query>
               \?[a-z0-9_=-]+

ee/spec/lib/banzai/filter/epic_reference_filter_spec.rb

@@ -189,6 +189,7 @@ RSpec.describe Banzai::Filter::EpicReferenceFilter do
   context 'url reference' do
     let(:link) { urls.group_epic_url(epic.group, epic) }
     let(:text) { "Check #{link}" }
+    let(:project) { create(:project) }
 
     before do
       epic.update_attribute(:group_id, another_group.id)
@@ -205,6 +206,12 @@ RSpec.describe Banzai::Filter::EpicReferenceFilter do
     it 'includes default classes' do
       expect(doc(text).css('a').first.attr('class')).to eq('gfm gfm-epic has-tooltip')
     end
+
+    it 'matches link reference with trailing slash' do
+      doc2 = reference_filter("Fixed (#{link}/.)")
+
+      expect(doc2).to match(%r{\(#{Regexp.escape(epic.to_reference(group))}\.\)})
+    end
   end
 
   context 'full cross-refererence in a link href' do

spec/lib/banzai/filter/issue_reference_filter_spec.rb

@@ -296,6 +296,12 @@ RSpec.describe Banzai::Filter::IssueReferenceFilter do
         .to eq reference
     end
 
+    it 'link with trailing slash' do
+      doc = reference_filter("Fixed (#{issue_url + "/"}.)")
+
+      expect(doc.to_html).to match(%r{\(<a.+>#{Regexp.escape(issue.to_reference(project))}</a>\.\)})
+    end
+
     it 'links with adjacent text' do
       doc = reference_filter("Fixed (#{reference}.)")