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SED Regular Expression Problems

garry_m
garry_m asked
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Last Modified: 2008-03-04
I am trying to use SED to change the headers of an e-mail.

A typical e-mail might be:

Received: subnet.server.com
Date: Tue, 22 Apr 2004 15:33:15 BST
From: "Someone" <someone@someone.com>
To: "You" <you@someone.com>

etc etc.

I am trying to change the "Received: " part of the header to "Received: from " (which is not difficult at all.  The problem comes when some of the e-mails will already containg "Received: from " and so, they should not put another "from" in there.. i.e.

Received: from from subnet.server.com

The regular expression I am using at the moment (which does not work) is :

sed 's/Received:\s+(from\s+)/Received: from/' filename

Could you possibly tell me how to do this please?
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