Le 02/04/2011 00:42, Ian Kelly a écrit : > You could use a look-ahead assertion with a captured group: >>>>> regexp = r'\b(?P<dup>\w+)\b(?=.+\b(?P=dup)\b)' >>>> c = re.compile(regexp, re.IGNORECASE | re.DOTALL) >>>> c.findall(text) It works fine, lookahead assertions in action is what exatly i was looking for, many thanks.