[gentoo-user] OT - Extracting IP addresses with grep

[Michael Sullivan]

I have a mail directory with several hundred spammish emails that have
been collecting over the past month.  I haven't gotten around to
processing them yet (abuse@×××.net if available, blocked if not)  I
would like to write a script that would extract the IP addresses from
all these emails, but I can't figure out how to get grep to cooperate.
I created a perl regular expression for matching against IP addresses
and tried to pass it to grep, but it wouldn't return anything.  I don't
know what I'm doing wrong.  Here's my command:

michael@bullet ~/.maildir/.SPAM/cur $ cat * | grep -P m/\d+\.\d+\.\d
+\.\d+/

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