question on regular expressions

Darren Dale dd55 at
Fri Dec 3 19:39:32 CET 2004

Michael Fuhr wrote:

> Darren Dale <dd55 at> writes:
>> I'm stuck. I'm trying to make this:
>> file://C:%5Cfolder1%5Cfolder2%5Cmydoc1.pdf,file://C
>> %5Cfolderx%5Cfoldery%5Cmydoc2.pdf
>> (no linebreaks) look like this:
>> ./mydoc1.pdf,./mydoc2.pdf
>> my regular expression abilities are dismal.
> This works for the example string you gave:
> newstring = re.sub(r'[^,]*%5[Cc]', './', examplestring)
> This replaces all instances of zero or more non-commas that are
> followed by '%5C' or '%5c' with './'.  Greediness causes the pattern
> to replace everything up to the last '%5C' before a comma or the
> end of the string.
> Regular expressions aren't the only way to do what you want.  Python
> has standard modules for parsing URLs and file paths -- take a look
> at urlparse, urllib/urllib2, and os.path.

Thanks to both of you. I thought re's were appropriate because the string I
gave is buried in an xml file. A more representative example is:


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