Regular expression bug?
andrew at acooke.org
Thu Feb 19 20:51:06 CET 2009
i wonder what fraction of people posting with "bug?" in their titles here
actually find bugs?
anyway, how about:
(you have to specify what you're matching and lookahead/back doesn't do
Ron Garret wrote:
> I'm trying to split a CamelCase string into its constituent components.
> This kind of works:
>>>> re.split('[a-z][A-Z]', 'fooBarBaz')
> ['fo', 'a', 'az']
> but it consumes the boundary characters. To fix this I tried using
> lookahead and lookbehind patterns instead, but it doesn't work:
>>>> re.split('((?<=[a-z])(?=[A-Z]))', 'fooBarBaz')
> However, it does seem to work with findall:
>>>> re.findall('(?<=[a-z])(?=[A-Z])', 'fooBarBaz')
> ['', '']
> So the regular expression seems to be doing the Right Thing. Is this a
> bug in re.split, or am I missing something?
> (BTW, I tried looking at the source code for the re module, but I could
> not find the relevant code. re.split calls sre_compile.compile().split,
> but the string 'split' does not appear in sre_compile.py. So where does
> this method come from?)
> I'm using Python2.5.
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