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From: Allen Halsey <allenhalsey AT gmail DOT com>
Subject:  1.5, 1.7: Bash regex not recognizing word boundaries
Date: Mon, 19 Oct 2009 20:50:32 +0000 (UTC)
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These should print "Matched", but they don't:

$ REGEX='\bcat\b'
$ [[ "dog cat bird" =~ $REGEX ]] && echo "Matched"
$ REGEX='\<cat\>'
$ [[ "dog cat bird" =~ $REGEX ]] && echo "Matched"
$

egrep works as expected:

$ egrep -q '\bcat\b' <(echo "dog cat bird") && echo "Matched"
Matched
$ egrep -q '\<cat\>' <(echo "dog cat bird") && echo "Matched"
Matched
$

Behavior is same on 1.5 and 1.7.

Allen




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