1 files changed, 19 insertions, 0 deletions
diff --git a/lib/gitlab/utils/markdown.rb b/lib/gitlab/utils/markdown.rb
new file mode 100644
index 00000000000..82c4a0e3b23
--- /dev/null
+++ b/lib/gitlab/utils/markdown.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Utils
+    module Markdown
+      PUNCTUATION_REGEXP = /[^\p{Word}\- ]/u.freeze
+
+      def string_to_anchor(string)
+        string
+          .strip
+          .downcase
+          .gsub(PUNCTUATION_REGEXP, '') # remove punctuation
+          .tr(' ', '-') # replace spaces with dash
+          .squeeze('-') # replace multiple dashes with one
+          .gsub(/\A(\d+)\z/, 'anchor-\1') # digits-only hrefs conflict with issue refs
+      end
+    end
+  end
+end