多段非公式RTフィルタ earthquake.gem plugin （invalid byte sequence in UTF-8 (ArgumentError) 対応版）

rt_rt_filter.rb

# -*- coding: utf-8 -*-
require 'utf8-cleaner'

Earthquake.init do
  output_filter do |item|
    next if item.nil? || item["text"].nil?
    str = UTF8Cleaner::URIString.new(item["text"]).cleaned
    !(/^.+[¥"QR]T(?:[:\s]*@[A-Za-z0-9_]|\(via[:\s]*@[A-Za-z0-9_]).+[¥"QR]T/ =~ str)
  end
end