replacing a part of a string using a regexp

[Rajarshi Guha]

On Thu, 18 Jul 2002 17:11:15 -0400, Fredrik Lundh wrote:

> Rajarshi Guha wrote:
> 
>> a line contains:
>>
>> <a href="www.myurl.com">
>>
>> And I want to replace the url and make the line:
>>
>> <a href="http://myserver.com/prog.py?www.myurl.com">
>>
>> Using re.sub I can substitute the whole string bewteen quotes, but the
>> substituion needs to use the string that is *found* in the quotes.
>>
>> How can I access the matched portion in a re.sub() expression?
> 
> (if you don't read the documentation, how come you always find the right
> module/function to use? ;-)

I did read the docs, but its been a hectic day and my brain seems to have
slowed down :(