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bug#47264: RFE: pcre2 support

From: Paul Eggert
Subject: bug#47264: RFE: pcre2 support
Date: Mon, 5 Apr 2021 09:58:39 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1

On 4/5/21 1:31 AM, Jeffrey Walton wrote:
I could not find a good document explaining the conversion process
from PCRE to PCRE2. I finally gave up after about 4 hours because I
lacked the necessary PCRE experience.

I had a similar experience years ago.

Part of my worry was that PCRE is squirrelly about dealing with improperly-coded data - it has undefined behavior in that case, which is unacceptable for 'grep'. So one must be verrrry careful in doing any API conversion. I didn't have the time, at the time. Still don't.

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