On Mon, 6 Sep 2010 15:11:30 +0200 Matteo Castellini wrote: > sys.stdout.write(re.sub(r'^(From:? .*) (a) ', r'\1@', line)) Woops, c'è un grouping inutile: sys.stdout.write(re.sub(r'^(From:? .*) a ', r'\1@', line)) bye! matteo