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Re: :alnum: broken?

From: Paul Eggert
Subject: Re: :alnum: broken?
Date: Sat, 22 Feb 2020 23:51:11 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/22/20 7:49 PM, Richard Stallman wrote:
Can we do something to report such errors?

Yes, it would be easy to modify the Emacs regular expression parser to signal an error for patterns like [:alnum:]. GNU grep has been reporting these as errors ever since Paolo Bonzini changed it to do so in 2010, and it's been a win there. However, Eli's the Emacs maintainer and he has not yet been convinced to change GNU Emacs to be consistent with GNU grep.

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