def check_email_and_finish_registration(email, reg_handler)
  valid = false

  if email.to_s != '' && email.to_s.length != 0 && email.includes?('@') && /^[0-9a-zA-Z\.]+$/.match(email.split('@').first) && /^[0-9a-zA-Z\.]+$/.match(email.split('@')[1])
    valid = true
  end

  if valid
    reg_handler.success = true unless reg_handler.process_type == 5 || POST::get('from_europe')

    MD5 = Digest::MD5.new
    MD5 << POST::get('password')
    reg_handler.registered_user = {email: email, username: POST::get('username'), password: MD5.hexdigest }

    db = DB::open()
    db.create_user({email: email, username: POST::get('username'), password: MD5.hexdigest })
  end
end