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For lists you could do something like:

#!/usr/bin/ksh

A="1 2 3 4"
B="5 6 2 7"

for a in $A; do
for b in $B; do
(( $a == $b )) && print $a
done
done
...

OK, some grep implementations support only limited regular expressions (/usr/bin/grep on Solaris, for example),
but .? (note, there is no backslash before the ?) should work with egrep.
Did you...