Clean up a Facebook chat from https://www.facebook.com/messages/

fb_cleanup.rb

#!/usr/bin/env ruby
# coding: utf-8
#
# Clean up a Facebook chat
#
# Usage:
# 1) copy a chat from https://www.facebook.com/messages/, paste into new file `chat.md`.
# 2) ruby fb_cleanup.rb chat.md
#
# Author: Peter Hillerström (peterhil)
# LICENSE: MIT

chat = File.open(ARGV[0], "r:UTF-8", &:read)
puts chat.gsub /^
([[:alpha:]]+\s+[[:alpha:]]+)\s+  # Name
(\d{2}\/\d{2}\/\d{4}\s+)?(\d{2}:\d{2})\s+  # Date and time
([[:alpha:]]+\s+[[:alpha:]]+)  # Name
/ux, "\n- \\3 \\1\n"