Hi Mats
Just out of curiosity I tested your code
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
on AIX
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
# #!/bin/sh
#
# lager=/tmp/tillf
#
# {
> echo -e "abab\nbaab\nabba" | egrep '^(a?[ab]|ba){2}$'
> echo -e "abab\nbaab\nabba" | egrep '^(ba|a?[ab]){2}$'
> } > $lager # | tee $lager
#
# echo "$(wc -l < $lager) matches out of intended 6."
4 matches out of intended 6.
# cat $lager
baab
abba
baab
abba
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
On a SuSE 10.0
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[EMAIL PROTECTED]:~> echo "$(wc -l < $lager) matches out of intended 6."
6 matches out of intended 6.
[EMAIL PROTECTED]:~> cat $lager
abab
baab
abba
abab
baab
abba
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
On Bering 1.2
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
greatwall: -root-
# echo "$(wc -l < $lager) matches out of intended 6."
5 matches out of intended 6.
greatwall: -root-
# cat $lager
abab
abba
abab
baab
abba
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
On Bering 3.x
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
gatekeeper# #!/bin/sh
gatekeeper#
gatekeeper# lager=/tmp/tillf
gatekeeper#
gatekeeper# {
> echo -e "abab\nbaab\nabba" | egrep '^(a?[ab]|ba){2}$'
> echo -e "abab\nbaab\nabba" | egrep '^(ba|a?[ab]){2}$'
> } > $lager # | tee $lager
gatekeeper#
gatekeeper# echo "$(wc -l < $lager) matches out of intended 6."
5 matches out of intended 6.
gatekeeper# cat $lager
abab
abba
abab
baab
abba
In this selection the only system which interprets your code 'right' is
a fully blown linux. Mind you, Bering 1.2 has a sed binary as does AIX.
I guess your code is not very portable then :-(
cheers
Erich
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