You're not very specific in your question... but if 
Received: (qmail 21565 invoked by uid 9); 7 Apr 2001 13:27:27 -0000
To: php-general@lists.php.net
From: "Andre Bajew" <AndreBajew@TechnologyArt.com>
Date: Sat, 7 Apr 2001 08:27:44 -0500

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is in $line, you could: 

my ($extract) = $line =~ m#^(From: .*?)$#m;

[download]

- FrankG

In reply to Re: Extracting info by how do i know if the string is regular expression
in thread Extracting info by HTTP-404

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