string.rb

module Ext 
  module String
    def self.included(base)
      base.class_eval do
        include InstanceMethods
      end
    end
      
    module InstanceMethods  
      def br_to_return
        self.gsub(/<(BR|br|BR \/|br \/)>/, "\n")
      end
      
      def br_to_return!
        self.gsub!(/<(BR|br|BR \/|br \/)>/, "\n")
      end

      def return_to_br
        self.gsub(/\r\n/, "\n").gsub(/\r/, "\n").gsub(/\n/, "<br />")
      end
    
      def return_to_br!
        self.gsub!(/\r\n/, "\n")
        self.gsub!(/\r/, "\n")
        self.gsub!(/\n/, "<br />")
      end
    
      def strip_html_tag
        self.gsub(/<[^<>]*>/,"") while /<[^<>]*>/ =~ self
      end
    
      def strip_html_tag!
        self.gsub!(/<[^<>]*>/,"") while /<[^<>]*>/ =~ self
      end
    
      def strip_return
        self.gsub(/\r\n/, "\n").gsub(/\r/, "\n").gsub(/\n/, "")
      end
    
      def strip_return!
        self.gsub!(/\r\n/, "\n")
        self.gsub!(/\r/, "\n")
        self.gsub!(/\n/, "")
      end
    end
  end
end

String.send :include, Ext::String