Regular expression negative look-ahead

Date	2013-07-01 17:07 -0600
Subject	Regular expression negative look-ahead
From	Jason Friedman <jsf80238@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.4102.1372749590.3114.python-list@python.org> (permalink)

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I have table names in this form:
MY_TABLE
MY_TABLE_CTL
MY_TABLE_DEL
MY_TABLE_RUN
YOUR_TABLE
YOUR_TABLE_CTL
YOUR_TABLE_DEL
YOUR_TABLE_RUN

I am trying to create a regular expression that will return true for only
these tables:
MY_TABLE
YOUR_TABLE

I tried these:
pattern = re.compile(r"_(?!(CTL|DEL|RUN))")
pattern = re.compile(r"\w+(?!(CTL|DEL|RUN))")
pattern = re.compile(r"(?!(CTL|DEL|RUN)$)")

But, both match.
I do not need to capture anything.

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Regular expression negative look-ahead Jason Friedman <jsf80238@gmail.com> - 2013-07-01 17:07 -0600
  Re: Regular expression negative look-ahead Neil Cerutti <neilc@norwich.edu> - 2013-07-02 12:15 +0000

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