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bug#24800: expr 8.25 seems to treat 0 in character class in paren incorr


From: Pádraig Brady
Subject: bug#24800: expr 8.25 seems to treat 0 in character class in paren incorrectly
Date: Wed, 26 Oct 2016 18:22:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 26/10/16 17:15, Paul Eggert wrote:
> There's no bug here: "expr E" exits with status 1 if E evaluates to 0, 
> and expressions like "0 : '\([0-9]\)$'" do evaluate to 0.

Yes this is not a bug but is very confusing.
I've updated with this specific example at:
http://www.pixelbeat.org/docs/coreutils-gotchas.html#expr





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