class Regexp
	def each_match(str)
	     	#start = 0
		text =""
	   	#while matchdata = self.match(str, start)
	   	while match_data = self.match(str)
	   		text << match_data.pre_match	
		     	yield text, match_data
		      	#start = matchdata.end(0)
		      	str = match_data.post_match
		end
		text << str
	end
end

module ApplicationHelper
# In Ruby 1.9, you can also associate a block with a call to match. If no match is found,
# the block is ignored, and match returns nil. If a match is found, however, the
# MatchData object is passed to the block, and the match method returns whatever the
# block returns.

	def escape_precode(stprivater)
		return  if str.empty?
		pattern = %r{(<pre\s*[^>]*>)(\s*)(<code\s*[^>]*>)?(.*?)(</code>)?(\s*)(</pre>)}im
		return pattern.each_match(str) do |text,match_data| 
			if match_data.length == 8 
				text << handle_match8(match_data)
			elsif match_data.length == 6
				text << thandle_match6(match_data)
			end
		end	
	end

	protected
	def handle_match6(match_data)
		#return  "" if match_data.nil? or match_data.length != 6
		rt = "#{match_data[1]}#{match_data[2]}"
		rt << match_data[3].gsub(/</,'<').gsub(/>/,'>')
		rt << "#{match_data[4]}#{match_data[5]}"
	end

	def handle_match8(match_data)
		rt = "#{match_data[1]}#{match_data[2]}#{match_data[3]}"
		rt << match_data[4].gsub(/</,'<').gsub(/>/,'>')
		#rt << begin match_data[4].gsub!(/</,'<').gsub!(/>/,'>'); rescue  => ex;ex.message; end
		rt << "#{match_data[5]}#{match_data[6]}#{match_data[7]}"
	end
end
	

text3 = <<code>

<div id="list">
  <div>
    <%= @commentable.title %>
  </div>
  <div style="line-height:2.2em">
    <%=sanitize escape_precode @commentable.body %>
  </div>

  <h3>Listing comments</h3>
  <% @root_comments.each do |root| %>
    <% Comment.each_with_level( root.self_and_descendants) do |comment, level| %>
        <%= ('<div class="prefix_1">' * level).html_safe %>
        <hr/><%= comment.id %>:<%= comment.parent_id %>
        <div style="line-height:2.2em"> <%= begin sanitize(escape_precode( comment.body)) rescue  comment.body  end%>
        </div>
      <div>  
        <spen><%= comment.created_at %></spen>
        <spen>by <%= comment.user.email %></spen>
         <spen><%= link_to 'Reply', post_comment_path(@commentable,comment) %></spen>
       <spen><%= link_to 'Edit', edit_post_comment_path(@commentable,comment) %></spen>
        <spen><%= link_to 'Destroy', post_comment_path(@commentable, comment), confirm: 'Are you sure?', method: :delete %></spen>
      </div>
     <%= ('</div>' * level).html_safe %> 
    <% end %>
  <% end %>

  <br />
  <h2>New Comment</h2>  
  <%= form_for [@commentable, Comment.new] do |f| %>  
    <div>  
        <%= f.label :body %> <br/> 
        <%= f.text_area :body, rows: 12, cols: 68  %>  
      </div>  
      <div><%= submit_tag "Add Comment" %>   <%= link_to t('Back'), you_posts_path %></div>  
   <% end %>  
 
</code></pre>
<pre>
<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2>

      <ul>
      <% @post.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>
</pre>
EOT

include ApplicationHelper
puts Time.now
puts escape_precode(text3)
puts Time.now