05-14-2008
If including the last directory component as well is acceptable then you can do [^/]*/[^/]*$ to get the last and the penultimate directory (#1 and half #2) and then if you trim #1 and the last slash, you get the real answer for #2.
*? is certainly not a plain old grep regular expression.
What's the point of this exercise?
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LEARN ABOUT OPENDARWIN
nigrep
NIGREP(1) General Commands Manual NIGREP(1)
NAME
nigrep - search for a regular expression in the NetInfo hierarchy
SYNOPSIS
nigrep expression [ -t ] domain [ directory ... ]
DESCRIPTION
nigrep searches through the specified domain argument for a regular expression. It searches the domain's directory hierarchy depth-first
starting from the root directory. It can also start from each directory specified on the command line.
The domain argument can be specified as an absolute or relative domain name. The domain argument can be specified as a network address or
hostname and tag if preceded by the -t option.
On output, nigrep prints the directory ID number of the directory which contains the regular expression, and the property key and values
where it was found. A line is printed for each property that contains the regular expression.
OPTIONS
-t Specify domain as a network address or hostname and tag.
EXAMPLES
% nigrep '[Nn]et' /
% nigrep '[Nn]et' -t 192.42.172.17/local
% nigrep '192.[0-9]+.172' -t astra/network /machines
% nigrep '/Net/server.*/Users' .. /users /mounts
SEE ALSO
netinfo(5)
AUTHOR
Marc Majka, Apple Computer Inc.
Apple Computer, Inc. August 9, 1994 NIGREP(1)