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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::headline::useperljournals

XML::RSS::Headline::UsePerlJournals(3pm)		User Contributed Perl Documentation		  XML::RSS::Headline::UsePerlJournals(3pm)

NAME

       XML::RSS::Headline::UsePerlJournals - XML::RSS::Headline Example Subclass

VERSION

       2.2

SYNOPSIS

       You can also subclass XML::RSS::Headline to tweak the rss content to your liking.  In this example. I change the headline to remove the
       date/time and add the Use Perl Journal author's ID.  Also in this use Perl; rss feed you get the actual link to the journal entry, rather
       than the link just to the user's journal.  (meaning that the journal URLs contain the entry's ID)

	   use XML::RSS::Feed;
	   use XML::RSS::Headline::UsePerlJournals;
	   use LWP::Simple qw(get);

	   my $feed = XML::RSS::Feed->new(
	       name  => "useperljournals",
	       hlobj => "XML::RSS::Headline::UsePerlJournals",
	       delay => 60,
	       url   => "http://use.perl.org/search.pl?tid=&query=&"
			. "author=&op=journals&content_type=rss",
	   );

	   while(1) {
	       $feed->parse(get($feed->url));
	       print $_->headline . "
" for $feed->late_breaking_news;
	       sleep($feed->delay);
	   }

       Here is the output from rssbot on irc.perl.org in channel #news (which uses these modules)

	   <rssbot>  + [pudge] New Cool Journal RSS Feeds at use Perl;
	   <rssbot>    http://use.perl.org/~pudge/journal/21884

MUTAITED METHOD

       $headline->item( $item )

       Init the object for a parsed RSS item returned by XML::RSS.

AUTHOR

       Jeff Bisbee, "<jbisbee at cpan.org>"

BUGS

       Please report any bugs or feature requests to "bug-xml-rss-feed at rt.cpan.org", or through the web interface at
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=XML-RSS-Feed>.  I will be notified, and then you'll automatically be notified of progress
       on your bug as I make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

	   perldoc XML::RSS::Headline::UsePerlJournals

       You can also look for information at:

       * AnnoCPAN: Annotated CPAN documentation
	   <http://annocpan.org/dist/XML-RSS-Feed>

       * CPAN Ratings
	   <http://cpanratings.perl.org/d/XML-RSS-Feed>

       * RT: CPAN's request tracker
	   <http://rt.cpan.org/NoAuth/Bugs.html?Dist=XML-RSS-Feed>

       * Search CPAN
	   <http://search.cpan.org/dist/XML-RSS-Feed>

ACKNOWLEDGEMENTS

       Special thanks to Rocco Caputo, Martijn van Beers, Sean Burke, Prakash Kailasa and Randal Schwartz for their help, guidance, patience, and
       bug reports. Guys thanks for actually taking time to use the code and give good, honest feedback.

COPYRIGHT &; LICENSE
       Copyright 2006 Jeff Bisbee, all rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       XML::RSS::Feed, XML::RSS::Headline, XML::RSS::Headline::PerlJobs, XML::RSS::Headline::Fark, POE::Component::RSSAggregator

perl v5.8.8							    2006-07-17				  XML::RSS::Headline::UsePerlJournals(3pm)
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