Remove all Lint/AmbiguousRegexpLiteral rubocop issues on code, and from rubocop_todo list

.rubocop_todo.yml

@@ -6,12 +6,6 @@
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 3
-Lint/AmbiguousRegexpLiteral:
-  Exclude:
-    - 'app/helpers/verification_helper.rb'
-    - 'spec/features/verification/residence_spec.rb'
-
 # Offense count: 3
 # Configuration parameters: AllowSafeAssignment.
 Lint/AssignmentInCondition:

app/helpers/verification_helper.rb

@@ -7,12 +7,12 @@ module VerificationHelper
   end
 
   def mask_phone(number)
-    match = number.match /\d{3}$/
+    match = number.match(/\d{3}$/)
     "******#{match}"
   end
 
   def mask_email(string)
-    match = string.match /^(\w{1,3})(.*)@(.*)/
+    match = string.match(/^(\w{1,3})(.*)@(.*)/)
 
     data_to_display = match[1]
     data_to_mask    = match[2]
@@ -21,4 +21,4 @@ module VerificationHelper
     data_to_display + "*"*data_to_mask.size + "@" + email_provider
   end
 
-end
+end

spec/features/verification/residence_spec.rb

@@ -56,7 +56,7 @@ feature 'Residence' do
 
     click_button 'Verify residence'
 
-    expect(page).to have_content /\d errors? prevented the verification of your residence/
+    expect(page).to have_content(/\d errors? prevented the verification of your residence/)
   end
 
   scenario 'Error on postal code not in census' do