You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: weak_passwords.rb
    path of file: ./repos/gitlabhq/lib/security
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
module Security
  module WeakPasswords
    # These words are predictable in GitLab's specific context, and
   
    
      def username_appears_in_password?(password, user)
        return false if user.username.blank?

        # Check for the full username
        substrings = [user.username]
        # Also check sub-strings in the username
        substrings += user.username.split(/[^\p{Alnum}]/)

        contains_predicatable_substring?(password, substrings)
      end