John Salerno wrote: > 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?
Do it all in one match / substitution using \1 to insert the value of the paragraph group at the new location: In [19]: test = "self.source += '<p>' + paragraph + '</p>\n\n'" In [20]: re.sub(r"'<p>' \+ (.*?) \+ '</p>\n\n'", r"'<p>%s</p>\n\n' % \1", test) Out[20]: "self.source += '<p>%s</p>\n\n' % paragraph" Kent -- http://mail.python.org/mailman/listinfo/python-list
