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Re: re module: Nothing to repeat, but no sre_constants.error: nothing to repeat ?

References	<CABicbJLzLM9As_Ji3EV3kZoV_5_OS129jnFdzZtbgBQTiNBDQA@mail.gmail.com> <CAHzaPEMbxr9K9i_qUouAmrk3VVm0_W23tL_z+9RxO1SQiLOxJA@mail.gmail.com> <CABicbJLpyVhDJfq7omb1n1UnwZoGt3NCJ+fdG8nvHh+a2m5BbA@mail.gmail.com> <4F3AA287.9070604@mrabarnett.plus.com>
From	Devin Jeanpierre <jeanpierreda@gmail.com>
Date	2012-02-14 20:43 -0500
Subject	Re: re module: Nothing to repeat, but no sre_constants.error: nothing to repeat ?
Newsgroups	comp.lang.python
Message-ID	<mailman.5816.1329270228.27778.python-list@python.org> (permalink)

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On Tue, Feb 14, 2012 at 1:05 PM, MRAB <python@mrabarnett.plus.com> wrote:
>> And yeah, even something as crazy as ()* works, but as soon as it
>> becomes (a*)* it doesn't work. Weird.
>>
> I think it's a combination of warning the user about something that's
> pointless,
> as in the case of "$*", and producing a pattern which could cause the
> internal
> regex engine to get stuck in an infinite loop.

Considering that ()* works fine, I can't imagine it ever gets stuck in
infinite loops. But I admit I am too lazy to check against the
interpreter.

Also, complete failure is an exceptionally (heh) poor way of warning
people about stuff. I hope that's not really it.

-- Devin

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Re: re module: Nothing to repeat, but no sre_constants.error: nothing to repeat ? Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-02-14 20:43 -0500

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