small problem with re.sub

Hi,
I have a html text stored as a string. Now I want to go through this string and find all 6 digit numbers and make links from them.
Im using re.sub and for some reason its not picking up the previously matched condition. Am I doing something wrong? This is what my code looks like:
htmlStr = re.sub('(?P<id>\d{6})','<a href=\"http://linky.com/(?P=id).html\">(?P=id)</a>',htmlStr)
It seems that it replaces it alright, but it replaces it literally. Am I not escaping certain characters?
Thanks again for the help.
Cheers

Animal Logic
http://www.animallogic.com

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