#
# RFC822 compliant regexp for email address validation
#
module Validator
  def self.valid_email_address?(email)
    email =~ /(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[\t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[\t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[\t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()@,;:\\".\[\]00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\]00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?(?:[^()@,;:\\".\[\]00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)(?:,\s*(?:(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[\t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|”(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*”(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()@,;:\\".\[\] 00-31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*))*)?;\s*)/
  end
end