Use Devise::Email::EXACT_PATTERN.

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    devise (1.3.0)
+    devise (1.3.1)
       bcrypt-ruby (~> 2.1.2)
       orm_adapter (~> 0.0.3)
       warden (~> 1.0.3)

lib/devise.rb

@@ -10,7 +10,7 @@ module Devise
   autoload :PathChecker, 'devise/path_checker'
   autoload :Schema, 'devise/schema'
   autoload :TestHelpers, 'devise/test_helpers'
-  autoload :EmailAddressValidation, 'devise/email'
+  autoload :Email, 'devise/email'
 
   module Controllers
     autoload :Helpers, 'devise/controllers/helpers'
@@ -92,12 +92,11 @@ module Strategies
   mattr_accessor :http_authentication_realm
   @@http_authentication_realm = "Application"
 
-  # Email regex used to validate email formats. Based on RFC 822 and retrieved from
-  # Sixarm email validation gem
+  # Email regex used to validate email formats. Based on RFC 822 and
+  # retrieved from Sixarm email validation gem
   # (https://github.com/SixArm/sixarm_ruby_email_address_validation).
-  include EmailAddressValidation
   mattr_accessor :email_regexp
-  @@email_regexp = EMAIL_ADDRESS_EXACT_PATTERN
+  @@email_regexp = Devise::Email::EXACT_PATTERN
 
   # Range validation for password length
   mattr_accessor :password_length

lib/devise/email.rb

@@ -1,23 +1,23 @@
-# This e-mail validation regexes were retrieved from SixArm Ruby e-mail validation gem (https://github.com/SixArm/sixarm_ruby_email_address_validation)
-
+# This e-mail validation regexes were retrieved from SixArm Ruby
+# e-mail validation gem (https://github.com/SixArm/sixarm_ruby_email_address_validation)
 # As said on https://github.com/SixArm/sixarm_ruby_email_address_validation/blob/master/LICENSE.txt,
 # we added it using Ruby license terms.
 
-module EmailAddressValidation
-
-  EMAIL_ADDRESS_QTEXT           = Regexp.new '[^\\x0d\\x22\\x5c\\x80-\\xff]', nil, 'n'
-  EMAIL_ADDRESS_DTEXT           = Regexp.new '[^\\x0d\\x5b-\\x5d\\x80-\\xff]', nil, 'n'
-  EMAIL_ADDRESS_ATOM            = Regexp.new '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+', nil, 'n'
-  EMAIL_ADDRESS_QUOTED_PAIR     = Regexp.new '\\x5c[\\x00-\\x7f]', nil, 'n'
-  EMAIL_ADDRESS_DOMAIN_LITERAL  = Regexp.new "\\x5b(?:#{EMAIL_ADDRESS_DTEXT}|#{EMAIL_ADDRESS_QUOTED_PAIR})*\\x5d", nil, 'n'
-  EMAIL_ADDRESS_QUOTED_STRING   = Regexp.new "\\x22(?:#{EMAIL_ADDRESS_QTEXT}|#{EMAIL_ADDRESS_QUOTED_PAIR})*\\x22", nil, 'n'
-  EMAIL_ADDRESS_DOMAIN_REF      = EMAIL_ADDRESS_ATOM
-  EMAIL_ADDRESS_SUB_DOMAIN      = "(?:#{EMAIL_ADDRESS_DOMAIN_REF}|#{EMAIL_ADDRESS_DOMAIN_LITERAL})"
-  EMAIL_ADDRESS_WORD            = "(?:#{EMAIL_ADDRESS_ATOM}|#{EMAIL_ADDRESS_QUOTED_STRING})"
-  EMAIL_ADDRESS_DOMAIN          = "#{EMAIL_ADDRESS_SUB_DOMAIN}(?:\\x2e#{EMAIL_ADDRESS_SUB_DOMAIN})*"
-  EMAIL_ADDRESS_LOCAL_PART      = "#{EMAIL_ADDRESS_WORD}(?:\\x2e#{EMAIL_ADDRESS_WORD})*"
-  EMAIL_ADDRESS_SPEC            = "#{EMAIL_ADDRESS_LOCAL_PART}\\x40#{EMAIL_ADDRESS_DOMAIN}"
-  EMAIL_ADDRESS_PATTERN         = Regexp.new "#{EMAIL_ADDRESS_SPEC}", nil, 'n'
-  EMAIL_ADDRESS_EXACT_PATTERN   = Regexp.new "\\A#{EMAIL_ADDRESS_SPEC}\\z", nil, 'n'
-
+module Devise
+  module Email
+    QTEXT           = Regexp.new '[^\\x0d\\x22\\x5c\\x80-\\xff]', nil, 'n'
+    DTEXT           = Regexp.new '[^\\x0d\\x5b-\\x5d\\x80-\\xff]', nil, 'n'
+    ATOM            = Regexp.new '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+', nil, 'n'
+    QUOTED_PAIR     = Regexp.new '\\x5c[\\x00-\\x7f]', nil, 'n'
+    DOMAIN_LITERAL  = Regexp.new "\\x5b(?:#{DTEXT}|#{QUOTED_PAIR})*\\x5d", nil, 'n'
+    QUOTED_STRING   = Regexp.new "\\x22(?:#{QTEXT}|#{QUOTED_PAIR})*\\x22", nil, 'n'
+    DOMAIN_REF      = ATOM
+    SUB_DOMAIN      = "(?:#{DOMAIN_REF}|#{DOMAIN_LITERAL})"
+    WORD            = "(?:#{ATOM}|#{QUOTED_STRING})"
+    DOMAIN          = "#{SUB_DOMAIN}(?:\\x2e#{SUB_DOMAIN})*"
+    LOCAL_PART      = "#{WORD}(?:\\x2e#{WORD})*"
+    SPEC            = "#{LOCAL_PART}\\x40#{DOMAIN}"
+    PATTERN         = Regexp.new "#{SPEC}", nil, 'n'
+    EXACT_PATTERN   = Regexp.new "\\A#{SPEC}\\z", nil, 'n'
+  end
 end