[New-bugs-announce] [issue6797] When Beginning Expression with Lookahead Assertion I get no Matches

[Jonathan Windle]

New submission from Jonathan Windle <jonathanwindle at gmail.com>:

Example Code:
import re
re.findall(r"(?![a-z0-9])0(?![a-z0-9])", "a0a 0 0 b0b")

The above code returns an empty list. I expect to get ['0', '0'] returned.

If I remove "(?![a-z0-9])" from the beginning of the expression string 
findall returns values as expected.

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components: Regular Expressions
messages: 92046
nosy: jwindle
severity: normal
status: open
title: When Beginning Expression with Lookahead Assertion I get no Matches
type: behavior
versions: Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6797>
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