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Re: possible bug in regex and dfa

From: Paul Eggert
Subject: Re: possible bug in regex and dfa
Date: Fri, 16 Jul 2021 21:58:56 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 7/15/21 1:48 PM, Arnold Robbins wrote:
The regexp used there, ".^", to my mind should be treated as invalid.

No, that regular expression is valid because "." matches newline in POSIX EREs. So the "." matches a newline, and the following "^" matches the start of the next line.

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