Pattern help!?

[Lennart Regebro]

I can't find a pattern that will match:
foo
But not
bar.foo

Any hints?

//Lennart

[M.-A. Lemburg]

Post by Lennart Regebro
foo
But not
bar.foo
Any hints?

Hi Lennart,

you can use a negative lookahead:

(?!bar\.)foo
--
Marc-Andre Lemburg
eGenix.com

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[Lennart Regebro]

Post by M.-A. Lemburg
(?!bar\.)foo

Ah, sorry for wasting peoples time by not including enough context. My bad.

I'm looking for a patterns for making a fixer, not a regexp. :-)

[Fred Drake]

Post by M.-A. Lemburg
(?!bar\.)foo

This is normally called a negative lookbehind, though.


  -Fred

--
Fred L. Drake, Jr.    <fdrake at acm.org>
"A storm broke loose in my mind."  --Albert Einstein

[Georg Brandl]

Post by Fred Drake

Post by M.-A. Lemburg
(?!bar\.)foo

This is normally called a negative lookbehind, though.

Both are slightly wrong: what Marc gave is a lookahead, but
ISTM he *should* have given a lookbehind :)

Georg

[Fred Drake]

Post by Georg Brandl
Both are slightly wrong: what Marc gave is a lookahead, but
ISTM he *should* have given a lookbehind :)

Which shows how often I don't use either. :-) Sorry for the
misinformation, Lennart!


  -Fred

--
Fred L. Drake, Jr.    <fdrake at acm.org>
"A storm broke loose in my mind."  --Albert Einstein

[Lennart Regebro]

Post by Georg Brandl
Both are slightly wrong: what Marc gave is a lookahead, but
ISTM he *should* have given a lookbehind :)

Which shows how often I don't use either.  :-)  Sorry for the
misinformation, Lennart!

This feels like a good example of why I avoid regexps. :-)

//Lennart

[Benjamin Peterson]

   foo
But not
   bar.foo
Any hints?

It's usually best to do something like "is_probably_builtin" in
lib2to3/fixer_utils.py.

[Lennart Regebro]

Post by Benjamin Peterson

   foo
But not
   bar.foo
Any hints?

It's usually best to do something like "is_probably_builtin" in
lib2to3/fixer_utils.py.

Ah, thanks! That's similar to what I did already, but I missed out on
this helper (as it's slightly weirdly named), and this one catches
several cases I didn't think of.

//Lennart