grep: echo -en "AB\nA B\n" | egrep 'A?B'

[p.p.]

if I do

echo -en "AB\nA B\n" | egrep 'A?B'

the result is
AB
A B

while, as I understand it, the second line containing the space should not 
match.

Is this a bug in grep or in my understanding of regular expressions?

I'm using
ubuntu 7.10
with
grep (GNU grep) 2.5.1

Cheers
Peter






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