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

From: Paul Eggert
Subject: bug#24800: expr 8.25 seems to treat 0 in character class in paren incorrectly
Date: Wed, 26 Oct 2016 09:15:22 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0
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.
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