06-07-2013
Thanks for the suggestion but using -F with grep did not work.
However I have diagnosed the problem...
The web page in question (url below) is being searched for the string "Currently out of stock", I had a look at the HTML in a hex editor and discovered that the first space (between 'Currently' and 'out') was not 0x20 but a pair of values: 0xC2 0xA0. A web search revealed that this is known as a non-breaking space which is used as a typesetting aid (in compatible standards such as HTML) to prevent an automatic line break. For instance it might be used instead of the space in the string "100 KM" to make certain that "KM" does not get pushed onto the line below by the HTML renderer, the HTML entity is " ", thus "100 KM" could be used in the HTML.
An imperfect fix involves using '.' (any char match) in my search string. So the following regex works: "Currently.out.of.stock". The single '.' matches the non-breaking space of 0xC2 0xA0 between 'Currently' and 'out'.
However neither [[:space:]] nor [[:blank:]] work at matching the non-breaking space.
The web page which has the non-breaking space:
SGP-CV5 | Xperia Tablet Z accessories | Technical Specifications | SGPCV5/B.AE | SGPCV5 | Sony
Non-breaking space on Wikipedia:
Non-breaking space - Wikipedia, the free encyclopedia
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LEARN ABOUT DEBIAN
www::wikipedia
WWW::Wikipedia(3pm) User Contributed Perl Documentation WWW::Wikipedia(3pm)
NAME
WWW::Wikipedia - Automated interface to the Wikipedia
SYNOPSIS
use WWW::Wikipedia;
my $wiki = WWW::Wikipedia->new();
## search for 'perl'
my $result = $wiki->search( 'perl' );
## if the entry has some text print it out
if ( $result->text() ) {
print $result->text();
}
## list any related items we can look up
print join( "
", $result->related() );
DESCRIPTION
WWW::Wikipedia provides an automated interface to the Wikipedia <http://www.wikipedia.org>, which is a free, collaborative, online
encyclopedia. This module allows you to search for a topic and return the resulting entry. It also gives you access to related topics which
are also available via the Wikipedia for that entry.
INSTALLATION
To install this module type the following:
perl Makefile.PL
make
make test
make install
METHODS
new()
The constructor. You can pass it a two letter language code, or nothing to let it default to 'en'.
## Default: English
my $wiki = WWW::Wikipedia->new();
## use the French wiki instead
my $wiki = WWW::Wikipedia->new( language => 'fr' );
WWW::Wikipedia is a subclass of LWP::UserAgent. If you would like to have more control over the user agent (control timeouts, proxies ...)
you have full access.
## set HTTP request timeout
my $wiki = WWW::Wikipedia->new();
$wiki->timeout( 2 );
You can turn off the following of wikipedia redirect directives by passing a false value to "follow_redirects".
language()
This allows you to get and set the language you want to use. Two letter language codes should be used. The default is 'en'.
my $wiki = WWW::Wikipedia->new( language => 'es' );
# Later on...
$wiki->language( 'fr' );
follow_redirects()
By default, wikipeda redirect directives are followed. Set this to false to turn that off.
search()
Which performs the search and returns a WWW::Wikipedia::Entry object which you can query further. See WWW::Wikipedia::Entry docs for more
info.
$entry = $wiki->search( 'Perl' );
print $entry->text();
If there's a problem connecting to Wikipedia, "undef" will be returned and the error message will be stored in "error()".
random()
This method fetches a random wikipedia page.
error()
This is a generic error accessor/mutator. You can retrieve any searching error messages here.
TODO
o Clean up results. Strip HTML.
o Watch the development of Special:Export XML formatting, eg: http://en.wikipedia.org/wiki/Special:Export/perl
SEE ALSO
o LWP::UserAgent
AUTHORS
Ed Summers <ehs@pobox.com>
Brian Cassidy <bricas@cpan.org>
COPYRIGHT AND LICENSE
Copyright 2003-2011 by Ed Summers
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.10.1 2011-04-05 WWW::Wikipedia(3pm)