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From: arnold@freefriends.org (Aharon Robbins)
Newsgroups: comp.compilers
Subject: Re: irregular expressions, syntax complexity
Date: 22 Feb 2023 08:53:05 GMT
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References: <AQHZRT1Nf7Ln0mpyG0extuZP9rnVPQ==> <23-02-052@comp.compilers> <23-02-053@comp.compilers> <23-02-055@comp.compilers>
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Keywords: syntax, lex
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In article <23-02-055@comp.compilers>,
Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
>Regular expression syntax is missing an operator that signifies the
>intersection of the sets recognized by the operand regexps.  Let's
>call this operator "&". ....
>
>Has anybody implemented such an operator at all?

Doug McIlroy did, if I understand things correctly. See
https://github.com/arnoldrobbins/mcilroy-regex/blob/master/README
for more info.

Arnold