Remove product suffix from anchors

lib/gitlab/utils/markdown.rb

@@ -4,9 +4,11 @@ module Gitlab
   module Utils
     module Markdown
       PUNCTUATION_REGEXP = /[^\p{Word}\- ]/u.freeze
+      PRODUCT_SUFFIX = /\((CORE|STARTER|PREMIUM|ULTIMATE)(\s+ONLY)?\)/.freeze
 
       def string_to_anchor(string)
         string
+          .gsub(PRODUCT_SUFFIX, '')
           .strip
           .downcase
           .gsub(PUNCTUATION_REGEXP, '') # remove punctuation

spec/lib/banzai/filter/table_of_contents_filter_spec.rb

@@ -65,6 +65,11 @@ RSpec.describe Banzai::Filter::TableOfContentsFilter do
         expect(doc.css('h1 a').first.attr('href')).to eq '#title-with-spaces'
       end
 
+      it 'removes a product suffix' do
+        doc = filter(header(1, "Title with spaces (ULTIMATE)"))
+        expect(doc.css('h1 a').first.attr('href')).to eq '#title-with-spaces'
+      end
+
       it 'appends a unique number to duplicates' do
         doc = filter(header(1, 'One') + header(2, 'One'))
 

spec/lib/gitlab/utils/markdown_spec.rb

@@ -52,6 +52,14 @@ RSpec.describe Gitlab::Utils::Markdown do
       end
     end
 
+    context 'when string has a product suffix' do
+      let(:string) { 'My Header (ULTIMATE)' }
+
+      it 'ignores a product suffix' do
+        is_expected.to eq 'my-header'
+      end
+    end
+
     context 'when string is empty' do
       let(:string) { '' }