Change simple format

Hi,
  I am changed simple format method and added first line code for
replacing spaces
for formatting in this it works but other code means new line
paragraphs are not working?
   I want a such method which format all white spaces, new line,
paragraphs.
   how it possible in ruby?

example:

def my_format(text)
    text.gsub!(/(' ')/, " ")
    text.gsub!(/(\r\n|\n|\r)/, "\n") # lets make them newlines
crossplatform
    text.gsub!(/\n\n+/, "\n\n") # zap dupes
    text.gsub!(/\n\n/, '</p>\0<p>') # turn two newlines into paragraph
    text.gsub!(/([^\n])(\n)([^\n])/, '\1\2<br />\3') # turn single
newline into
    content_tag("p", text)
  end