1 files changed, 14 insertions, 8 deletions
diff --git a/app/models/concerns/mentionable/reference_regexes.rb b/app/models/concerns/mentionable/reference_regexes.rb
index fe8fbb71184..b8fb3f71925 100644
--- a/app/models/concerns/mentionable/reference_regexes.rb
+++ b/app/models/concerns/mentionable/reference_regexes.rb
@@ -2,6 +2,8 @@
 
 module Mentionable
   module ReferenceRegexes
+    extend Gitlab::Utils::StrongMemoize
+
     def self.reference_pattern(link_patterns, issue_pattern)
       Regexp.union(link_patterns,
                    issue_pattern,
@@ -15,16 +17,20 @@ module Mentionable
       ]
     end
 
-    DEFAULT_PATTERN = begin
-      issue_pattern = Issue.reference_pattern
-      link_patterns = Regexp.union([Issue, Commit, MergeRequest, Epic].map(&:link_reference_pattern).compact)
-      reference_pattern(link_patterns, issue_pattern)
+    def self.default_pattern
+      strong_memoize(:default_pattern) do
+        issue_pattern = Issue.reference_pattern
+        link_patterns = Regexp.union([Issue, Commit, MergeRequest, Epic].map(&:link_reference_pattern).compact)
+        reference_pattern(link_patterns, issue_pattern)
+      end
     end
 
-    EXTERNAL_PATTERN = begin
-      issue_pattern = IssueTrackerService.reference_pattern
-      link_patterns = URI.regexp(%w(http https))
-      reference_pattern(link_patterns, issue_pattern)
+    def self.external_pattern
+      strong_memoize(:external_pattern) do
+        issue_pattern = IssueTrackerService.reference_pattern
+        link_patterns = URI.regexp(%w(http https))
+        reference_pattern(link_patterns, issue_pattern)
+      end
     end
   end
 end