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annoyances with tr

From: icewind
Subject: annoyances with tr
Date: Tue, 18 Jul 2006 18:36:53 +0200
User-agent: Thunderbird 1.5.0.4 (X11/20060615) 
input: "abc123abc"
call: tr "abc123abc" -d '[^0-9]'
output:abcabc

regex-rule: "^" is for "negating" the match

output should be "123"
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