change a string conditional

[Harvey Thomas]

> Mark wrote 
> > Hi
> > 
> > I need to a piece of python code that will take a string 
> > which may or may
> > not begin with www and change it to lists.
> > 
> > eg. www.domain.com becomes lists.domain.com
> > but if domain1.com (no www) the it still becomes lists.domain1.com
> > 
> > an example of a pattern match will be enough.(I do a bit of 
> > perl but never
> > done any python)
> > 
> > mark
> > 
> 
> Assuming that the string astring is not empty (if it is then 
> newstring will be empty), then 
> 
> newstring = re.sub('(www\.)?(.+)', lambda x:'www.%s' % 
> x.group(2), astring)
> 
> should do the trick
> 
>
Sorry, the example should of course be: 
newstring = re.sub('(www\.)?(.+)', lambda x:'lists.%s' % x.group(2), astring)

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