1 files changed, 22 insertions, 0 deletions
diff --git a/app/models/concerns/mentionable/reference_regexes.rb b/app/models/concerns/mentionable/reference_regexes.rb
new file mode 100644
index 00000000000..1848230ec7e
--- /dev/null
+++ b/app/models/concerns/mentionable/reference_regexes.rb
@@ -0,0 +1,22 @@
+module Mentionable
+  module ReferenceRegexes
+    def self.reference_pattern(link_patterns, issue_pattern)
+      Regexp.union(link_patterns,
+                   issue_pattern,
+                   Commit.reference_pattern,
+                   MergeRequest.reference_pattern)
+    end
+
+    DEFAULT_PATTERN = begin
+      issue_pattern = Issue.reference_pattern
+      link_patterns = Regexp.union([Issue, Commit, MergeRequest].map(&:link_reference_pattern))
+      reference_pattern(link_patterns, issue_pattern)
+    end
+
+    EXTERNAL_PATTERN = begin
+      issue_pattern = ExternalIssue.reference_pattern
+      link_patterns = URI.regexp(%w(http https))
+      reference_pattern(link_patterns, issue_pattern)
+    end
+  end
+end