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Full Discussion: problem using sed to match a string
Top Forums Shell Programming and Scripting problem using sed to match a string Post 302560981 by huffpuff on Sunday 2nd of October 2011 05:34:31 PM
Old 10-02-2011
problem using sed to match a string
Hi There!

I'm stuck with a problem trying to output some sections of a rss feed to my conky program using curl and sed.

The rss feed is for tide times and I wish to output the times but not the rest to the conky desktop. To do this I need to pull out the four instances of times that are in the format of '00:00'. Since the digits will vary I have to match the sequence of two digits followed by a colon followed by two digits. This is what I tried so far:

Code:
#RSS Setup
URI=http://www.tidetimes.org.uk/southampton-tide-times.rss #URI of RSS Feed
LINES=1 #Number of headlines

#Environment Setup
EXEC="/usr/local/bin/curl -s" #Path to curl
TODAY=`date +%Y%m%d`
#Work Start
$EXEC $URI | grep description |\
sed -e 's/\([0-9]{2}:[0-9]{2}\)*/(&)/'

I have to admit my knowledge of sed is a bit shaky and the above has outputted a lot of gibberish. Any suggestions as to how I might pull out the four instances of the tide times in the format '00:00'?
 

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LEARN ABOUT DEBIAN

xml::rss::libxml::magicelement

XML::RSS::LibXML::MagicElement(3pm)			User Contributed Perl Documentation		       XML::RSS::LibXML::MagicElement(3pm)

NAME

       XML::RSS::LibXML::MagicElement - Represent A Non-Trivial RSS Element

SYNOPSIS

	 us XML::RS::LibXML::MagicElement;
	 my $xml = XML::RSS::LibXML::MagicElement->new(
	   content => $textContent,
	   attributes => @attributes
	 );

DESCRIPTION

       This module is a handy object that allows users to access non-trivial RSS elements in XML::RSS style. For example, suppose you have an RSS
       feed with an element like the following:

	 <channel>
	   <title>Example</title>
	   <tag attr1="foo" attr2="bar">baz</tag>
	   ...
	 </channel>

       While it is simple to access the title element like this:

	 $rss->{channel}->{title};

       It was slightly non-trivial for the second tag. With this module, <tag> is parsed as a XML::RSS::LibXML::MagicElement object and then you
       can access all the elements like so:

	 $rss->{channel}->{tag};  # "baz"
	 $rss->{channel}->{tag}->{attr1}; # "foo"
	 $rss->{channel}->{tag}->{attr2}; # "bar"

METHODS

   new
       Create a new MagicElement object.

   attributes
       Returns the list of attributes associated with this element

   toString
       Returns the string representation of this object.  By default we use the "text content" of the found tag, but for XML::RSS compatibility,
       we use the concatenation of the attributes if no content is found.

AUTHOR

       Copyright 2005 Daisuke Maki <dmaki@cpan.org>. All rights reserved.

       Development partially funded by Brazil, Ltd. <http://b.razil.jp>

perl v5.12.4							    2011-09-17				       XML::RSS::LibXML::MagicElement(3pm)
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