Run rubocop -a

app/lib/activitypub/activity/emoji_react.rb

@@ -10,7 +10,7 @@ class ActivityPub::Activity::EmojiReact < ActivityPub::Activity
               @account.reacted?(original_status, name)
 
     custom_emoji = nil
-    if name =~ /^:.*:$/
+    if /^:.*:$/.match?(name)
       process_emoji_tags(@json['tag'])
 
       name.delete! ':'

app/lib/activitypub/activity/like.rb

@@ -22,7 +22,7 @@ class ActivityPub::Activity::Like < ActivityPub::Activity
     return false if name.nil?
 
     custom_emoji = nil
-    if name =~ /^:.*:$/
+    if /^:.*:$/.match?(name)
       process_emoji_tags(@json['tag'])
 
       name.delete! ':'

app/models/status_reaction.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: status_reactions

config/routes/api.rb

@@ -18,8 +18,8 @@ namespace :api, format: false do
 
         # foreign custom emojis are encoded as shortcode@domain.tld
         # the constraint prevents rails from interpreting the ".tld" as a filename extension
-        post '/react/:id', to: 'reactions#create', constraints: { id: /[^\/]+/ }
-        post '/unreact/:id', to: 'reactions#destroy', constraints: { id: /[^\/]+/ }
+        post '/react/:id', to: 'reactions#create', constraints: { id: %r{[^/]+} }
+        post '/unreact/:id', to: 'reactions#destroy', constraints: { id: %r{[^/]+} }
 
         resource :bookmark, only: :create
         post :unbookmark, to: 'bookmarks#destroy'

spec/fabricators/status_reaction_fabricator.rb

@@ -1,6 +1,6 @@
 Fabricator(:status_reaction) do
   account      nil
   status       nil
-  name         "MyString"
+  name         'MyString'
   custom_emoji nil
 end