[gentoo-user] OT - grep: The -P option is not supported

[Michael Sullivan <michael@espersunited.com>]

I have a script I wrote a couple of weeks ago.  Part of the script scans
email files and returns IP addresses found in them.  I did this with
this command:

cat * |  grep -Po "\[\d+\.\d+\.\d+\.\d+\]"

It worked fine right up until this afternoon.  Now I get this:

michael@bullet ~/spam $ cat * | grep -Po "\[\d+\.\d+\.\d+\.\d+\]"
grep: The -P option is not supported
michael@bullet ~/spam $

AFAIK, the only thing I've done between when it worked this morning and
when it didn't this afternoon is started an emerge -ND world on bullet.
Has anyone experienced this?  Should it go away on its own after the
emerge finishes, or is this functionality that has been phased out?
What can I do about it otherwise?

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