Message 340102 - Python tracker

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Author	mrabarnett
Recipients	Anders.Hovmöller, ezio.melotti, mrabarnett, serhiy.storchaka
Date	2019-04-12.19:53:42
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
Consider re.findall(r'.{0,2}', 'abcde'). It finds 'ab', then continues where it left off to find 'cd', then 'e'. It can also find ''; re.match(r'.', '') does match, after all. It could, in fact, an infinite number of ''. And what about re.match(r'()', '')? What should it do? Run forever? Raise an exception? At some point you have to make a decision as to what should happen, and the general consensus has been to match once.

Consider re.findall(r'.{0,2}', 'abcde').

It finds 'ab', then continues where it left off to find 'cd', then 'e'.

It can also find ''; re.match(r'.*', '') does match, after all.

It could, in fact, an infinite number of ''.

And what about re.match(r'()*', '')?

What should it do? Run forever? Raise an exception?

At some point you have to make a decision as to what should happen, and the general consensus has been to match once.

History
Date	User	Action	Args
2019-04-12 19:53:42	mrabarnett	set	recipients: + mrabarnett, ezio.melotti, serhiy.storchaka, Anders.Hovmöller
2019-04-12 19:53:42	mrabarnett	set	messageid: <[email protected]>
2019-04-12 19:53:42	mrabarnett	link	issue32308 messages
2019-04-12 19:53:42	mrabarnett	create