On 14/02/2012 15:53, Devin Jeanpierre wrote:
On Tue, Feb 14, 2012 at 10:05 AM, Vlastimil Brom
<vlastimil.b...@gmail.com> wrote:
However, is there any realistic usecase for repeated zero-width anchors?
Maybe. There is a repeated zero-width anchor is used in the Python re
test suite, which is what made me notice this. I assume that came from
some actual use-case. (see:
http://hg.python.org/cpython/file/096e856a01aa/Lib/test/test_re.py#l599
)
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 "$*", and producing a pattern which could cause the
internal
regex engine to get stuck in an infinite loop.
It is inconsistent in that it warns about "$*" but not "(?=$)*" even
though they are basically equivalent.
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