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Top Forums Shell Programming and Scripting SED: Extracting text between first occurance of foo in front of bar Post 302347852 by ArterialTool on Wednesday 26th of August 2009 04:39:50 PM
Old 08-26-2009
SED: Extracting text between first occurance of foo in front of bar

Suppose I have a text file that contains the tags <foo> and <bar>. The text file can have unlimted occurances of <foo> and <bar> and looks somthing like this:

Code:
<foo>

Some
Text

<foo>

Some 
Text

<bar>

Some
Text

<foo>

Some
Text

There is no set amount of times <foo> occurs before or after <bar>. In this example there are two occurrences before, but there could be more or less. The only unique identifier in the file is <bar> so the logic has to be based around it. My question is how do I write a SED function that extracts the text between <bar> and the <foo> above it?
 

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HTTP::Proxy::BodyFilter::tags(3pm)			User Contributed Perl Documentation			HTTP::Proxy::BodyFilter::tags(3pm)

NAME
HTTP::Proxy::BodyFilter::tags - A filter that outputs only complete tags SYNOPSIS
use HTTP::Proxy::BodyFilter::tags; use MyFilter; # this filter only works on complete tags my $filter = MyFilter->new(); # note that both filters will be run on the same messages # (those with a MIME type of text/html) $proxy->push_filter( mime => 'text/*', response => HTTP::Proxy::BodyFilter::tags->new ); $proxy->push_filter( mime => 'text/html', response => $filter ); DESCRIPTION
The HTTP::Proxy::BodyFilter::tags filter makes sure that the next filter in the filter chain will only receive complete tags. METHOD
This class defines two methods, that are called automatically: filter() Buffer incomplete tags to ensure that subsequent filters will only receive complete HTML tags. will_modify() This method returns a false value, thus indicating to the system that it will not modify data passing through. SEE ALSO
HTTP::Proxy, HTTP::Proxy::BodyFilter. AUTHOR
Philippe "BooK" Bruhat, <book@cpan.org>. COPYRIGHT
Copyright 2003-2006, Philippe Bruhat. LICENSE
This module is free software; you can redistribute it or modify it under the same terms as Perl itself. perl v5.12.4 2011-07-03 HTTP::Proxy::BodyFilter::tags(3pm)
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