Fix rubocop issues that are new to Ruby 2.4

app/controllers/epp_controller.rb

@@ -145,7 +145,9 @@ class EppController < ApplicationController
   # VALIDATION
   def latin_only
     return true if params['frame'].blank?
-    return true if params['frame'].match?(/\A[\p{Latin}\p{Z}\p{P}\p{S}\p{Cc}\p{Cf}\w_\'\+\-\.\(\)\/]*\Z/i)
+    if params['frame'].match?(/\A[\p{Latin}\p{Z}\p{P}\p{S}\p{Cc}\p{Cf}\w_\'\+\-\.\(\)\/]*\Z/i)
+      return true
+    end
 
     epp_errors << {
       msg: 'Parameter value policy error. Allowed only Latin characters.',

app/models/concerns/versions.rb

@@ -34,9 +34,13 @@ module Versions
     end
 
     def user_from_id_role_username(str)
-      user = ApiUser.find_by(id: $1) if str.match(/^(\d+)-(ApiUser:|api-)/)
+      if str.match(/^(\d+)-(ApiUser:|api-)/)
+        user = ApiUser.find_by(id: $1)
+      end
       unless user.present?
-        user = AdminUser.find_by(id: $1) if str.match(/^(\d+)-AdminUser:/)
+        user = if str.match(/^(\d+)-AdminUser:/)
+          AdminUser.find_by(id: $1)
+        end
         unless user.present?
           # on import we copied Registrar name, which may eql code
           registrar = Registrar.find_by(name: str)

app/models/nameserver.rb

@@ -100,7 +100,7 @@ class Nameserver < ActiveRecord::Base
 
   def check_puny_symbols
     regexp = /(\A|\.)..--/
-    errors.add(:hostname, :invalid) if hostname =~ regexp
+    errors.add(:hostname, :invalid) if hostname.match?(regexp)
   end
 
   def validate_ipv4_format

app/validators/contact/ident/reg_no_validator.rb

@@ -10,10 +10,9 @@ class Contact::Ident::RegNoValidator < ActiveModel::EachValidator
 
     return unless format
 
-    unless value.match?(format)
+    return if value.match?(format)
     record.errors.add(attribute, :invalid_reg_no, country: record.country)
   end
-  end
 
   private