new_contents: # -*- coding: utf-8 -*-
  """MSC: Credit card number printed.
  
  ---
  layout:     post
  error_code: MSC
  source:     ???
  source_url: ???
  title:      credit card number printed
  date:       2014-06-10 12:31:19
  categories: writing
  ---
  
  Credit card number printed.
  
  """
  from proselint.tools import blacklist
  
  err = "MSC102"
  msg = u"Don't put credit card numbers in plain text."
  
  credit_card_numbers = [
      "4\d{15}",
      "5[1-5]\d{14}",
      "3[4,7]\d{13}",
      "3[0,6,8]\d{12}",
      "6011\d{12}",
  ]
  
  check = blacklist(credit_card_numbers, err, msg)
  
subject: Add a credit card number checker