Hi, A newbie re query. >>> import re >>> s='one' >>> re.sub('(one)','only \\0',s) 'only \x00' >>> re.sub('(one)','only \0',s) 'only \x00' I expected the output to be 'only one' with \0 behaving like "&" in sed. What is wrong with my syntax? With warm regards, -Payal --