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

[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@isp.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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Re: [gentoo-user] OT - Extracting IP addresses with grep

[Willie Wong]

On Thu, Oct 12, 2006 at 01:51:05PM -0500, Michael Sullivan wrote:
> michael@bullet ~/.maildir/.SPAM/cur $ cat * | grep -P m/\d+\.\d+\.\d
> +\.\d+/

You might want the expression in quotes to prevent bash from intercepting 
those backslashes. 

 grep -P '\d+\.\d+\.\d+\.\d+'

HTH, 

W
-- 
Willie W. Wong                                      wwong@math.princeton.edu
408 Fine Hall,  Department of Mathematics,  Princeton University,  Princeton
A mathematician's reputation rests on the number of bad proofs he has given.
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