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
html::linkextor
HTML::LinkExtor(3pm) User Contributed Perl Documentation HTML::LinkExtor(3pm)
NAME
HTML::LinkExtor - Extract links from an HTML document
SYNOPSIS
require HTML::LinkExtor;
$p = HTML::LinkExtor->new(&cb, "http://www.perl.org/");
sub cb {
my($tag, %links) = @_;
print "$tag @{[%links]}
";
}
$p->parse_file("index.html");
DESCRIPTION
HTML::LinkExtor is an HTML parser that extracts links from an HTML document. The HTML::LinkExtor is a subclass of HTML::Parser. This means
that the document should be given to the parser by calling the $p->parse() or $p->parse_file() methods.
$p = HTML::LinkExtor->new
$p = HTML::LinkExtor->new( $callback )
$p = HTML::LinkExtor->new( $callback, $base )
The constructor takes two optional arguments. The first is a reference to a callback routine. It will be called as links are found. If
a callback is not provided, then links are just accumulated internally and can be retrieved by calling the $p->links() method.
The $base argument is an optional base URL used to absolutize all URLs found. You need to have the URI module installed if you provide
$base.
The callback is called with the lowercase tag name as first argument, and then all link attributes as separate key/value pairs. All
non-link attributes are removed.
$p->links
Returns a list of all links found in the document. The returned values will be anonymous arrays with the following elements:
[$tag, $attr => $url1, $attr2 => $url2,...]
The $p->links method will also truncate the internal link list. This means that if the method is called twice without any parsing
between them the second call will return an empty list.
Also note that $p->links will always be empty if a callback routine was provided when the HTML::LinkExtor was created.
EXAMPLE
This is an example showing how you can extract links from a document received using LWP:
use LWP::UserAgent;
use HTML::LinkExtor;
use URI::URL;
$url = "http://www.perl.org/"; # for instance
$ua = LWP::UserAgent->new;
# Set up a callback that collect image links
my @imgs = ();
sub callback {
my($tag, %attr) = @_;
return if $tag ne 'img'; # we only look closer at <img ...>
push(@imgs, values %attr);
}
# Make the parser. Unfortunately, we don't know the base yet
# (it might be different from $url)
$p = HTML::LinkExtor->new(&callback);
# Request document and parse it as it arrives
$res = $ua->request(HTTP::Request->new(GET => $url),
sub {$p->parse($_[0])});
# Expand all image URLs to absolute ones
my $base = $res->base;
@imgs = map { $_ = url($_, $base)->abs; } @imgs;
# Print them out
print join("
", @imgs), "
";
SEE ALSO
HTML::Parser, HTML::Tagset, LWP, URI::URL
COPYRIGHT
Copyright 1996-2001 Gisle Aas.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2011-10-15 HTML::LinkExtor(3pm)