regular expressions, substituting and adding in one step?

Ok, this might look familiar. I'd like to use regular expressions to change this line:

self.source += '<p>' + paragraph + '</p>\n\n'

to read:

self.source += '<p>%s</p>\n\n' % paragraph

Now, matching the middle part and replacing it with '%s' is easy, but how would I add the extra string to the end of the line? Is it done all at once, or must I make a new regex to match?

Also, I figure I'd use a group to match the word 'paragraph', and use that group to insert the word at the end, but how will I 'retain' the state of \1 if I use more than one regex to do this?

I'd like to do this for several lines, so I'm trying not to make it too specific (i.e., matching the entire line, for example, and then adding text after it, if that's possible).

So the questions are, how do you use regular expressions to add text to the end of a line, even if you aren't matching the end of the line in the first place? Or does that entail using separate regexes that *do* do this? If the latter, how do I retain the value of the groups taken from the first re?

Thanks, hope that made some sense.
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