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Full Discussion: sed to extract a multiline subject from a mail message
Top Forums Shell Programming and Scripting sed to extract a multiline subject from a mail message Post 302766847 by alister on Tuesday 5th of February 2013 02:37:56 PM
Old 02-05-2013
Quote:
Originally Posted by twisterbr
Tried this:
Code:
sed 'N;s/^Subject:.*/Subject: \1 string/;P;D;'

And i get the ' invalid reference \1 on `s' command's RHS' error.
There's no \(...\) expression for the \1 backreference to refer to.

Appending a string to the pattern space does not require backreferences:
Instead of s/\(.*\)/\1 string/, use s/.*/& string/

If you want to append something to the line following the line that begins with "Subject:":
Code:
/^Subject:/{n; s/.*/& addendum/;}

Regards,
Alister

---------- Post updated at 02:37 PM ---------- Previous update was at 02:00 PM ----------

Quote:
Originally Posted by twisterbr
But.... now I have another problem. When the subject has only 1 line, like this:

Code:
From: test@domain.com
Subject: Re: U =?ISO-8859-1?Q?qu=EA=3F!=3F!=3F!!_wtff_=E7=E3o_=ED=F3?= 
Date: 23/05/2012

The String gets written in the end of the 'Date:' line

How can I get both regex working (with 1 and 2 lines) on the same sed command?
Test whether the pattern space contains \nDate: then insert the string appropriately (either before the newline if there's a match or at the end of the pattern space if there isn't).

Regards,
Alister
 

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LEARN ABOUT DEBIAN

www::topica::mail

WWW::Topica::Mail(3pm)					User Contributed Perl Documentation				    WWW::Topica::Mail(3pm)

NAME

       WWW::Topica::Mail - parse a single Topica mailing list mail

SYNOPSIS

	   my $index = WWW::Topic::Index->new($index_html);

	   foreach my $mess_id ($index->message_ids) {
	       # the mail has some information and also provides a link to the reply ...
	       my $mail  = WWW::Topica::Mail->new($topica->fetch_mail($mess_id), $mess_id);
	       # which has other information (like the un-htmled mail and the email address) ...
	       my $reply = WWW::Topica::Reply->new($topica->fetch_reply($mail->id, $mail->eto), $mail->id, $mail->eto);
	   }

	   print "Next offset is ".$index->next."
";
	   print "Previous offset is ".$index->prev."
";

DESCRIPTION

       Used to parse a single message page from Topica.com's mailing list indexes.

       Message pages have the subject and the date and time of the mail being sent as well as a full name of each sender.

METHODS

   new <page html> <id>
       Takes the page html and the message-id and parses the html.

   parse <html>
       Parse the html to get message ids and next & prev offsets.

   id
       Get the id of this mail

   eto
       Get the eto of the next reply we need to get

   date
       Get the date of this mail

   subject
       The subject of the mail

   from
       Get the name of the person it was from

   body
       Get the body of the mail.

AUTHOR

       Simon Wistow <simon@thegestalt.org>

COPYRIGHT

       Copyright (c) 2004, Simon Wistow

perl v5.10.1							    2006-01-03						    WWW::Topica::Mail(3pm)
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