Follow-up Comment #1, bug #21199 (project grep):
On what system and what distro are you seeing this? Because here on Gentoo
and Ubuntu Feisty it is behaving as expected, and even a plain grep-2.5.1 does
the right thing:
$ echo 88-88 | egrep -o '([0-9])([0-9])-(1|2){1}'
88-8
$ echo 88-88 | egrep -o '([0-9])([0-9])-(1|2){2}'
88-88
$ echo 88-88 | egrep -o '([0-9])([0-9])-(1|2){3}'
$ echo 88-88 | egrep -o '([0-9])([0-9])-(1|2){4}'
$ echo 88-81 | egrep -o '([0-9])([0-9])-(1|2){1}'
88-8
$ echo 88-81 | egrep -o '([0-9])([0-9])-(1|2){2}'
$ echo 88-81 | egrep -o '([0-9])([0-9])-(1|2){3}'
$ echo 88-81 | egrep -o '([0-9])([0-9])-(1|2){4}'
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