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Re: why is this regexp invalid: "\\(?1:\\)"
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From: |
Stefan Monnier |
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Subject: |
Re: why is this regexp invalid: "\\(?1:\\)" |
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Date: |
Wed, 08 Dec 2010 15:27:01 -0000 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
> can you help me understand why the following simple
> expression gives an "Invalid regexp" error:
> (string-match "\\(?1:\\)" "")
> while removing the explicit group number gives no error:
> (string-match "\\(?:\\)" "")
My guess is that you're using a version of Emacs that is too old to
support explicit group numbers (which was a new feature in Emacs-23.1,
IIRC).
Stefan
- Re: why is this regexp invalid: "\\(?1:\\)",
Stefan Monnier <=