re_format(7) on FreeBSD
The text 30c0c59135cb, as FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE, FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.
POSIX 1003.2 regular expressions
The text 30c0c59135cb, as FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE, FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.
POSIX 1003.2 regular expressions