<image href = "images/cron1.png"><<alt>></alt></image>
More than a single example would be better. Note that <image> is "... an ancient and poorly supported precursor to the <img> element. It should not be used." whereas <img> is an empty element, meaning it can't have content. <img hrefsrc="images/cron1.png" alt="" /> would be a valid HTML example.
But assuming your example is accurate, i.e. it is not actually HTML (and ignoring the likely erroneous <<alt>>), you can use Mojo::DOM in XML mode to parse your data. I've made a guess that by "empty" you mean that it does not contain other tags or non-whitespace text, but please clarify this as well.
use warnings;
use strict;
use Mojo::DOM;
my $html = <<'END_HTML';
<image href = "images/cron1.png"></image>
<image href = "images/cron2.png"> </image>
<image href = "images/cron3.png">abc</image>
<image href = "images/cron4.png"><alt></alt></image>
<image href = "images/cron5.png"><alt><br/></alt></image>
<image href = "images/cron6.png"><i><alt> </alt></i></image>
<image href = "images/cron7.png"><alt>xyz</alt></image>
<image href = "images/cron8.png"><alt><b>xyz</b>ijk</alt></image>
<image href = "images/cron9.png">abc <alt><!-- foo --></alt> def</imag
+e>
END_HTML
my $dom = Mojo::DOM->new->xml(1)->parse($html);
$dom->find('image alt')->grep(sub { # find all <alt> tags inside <imag
+e>
not $_->child_nodes->grep(sub { # check whether they have content
$_->type eq 'text' || $_->type eq 'cdata'
? $_->content=~/\S/ : $_->type ne 'comment'
})->size;
})->map('remove');
print $dom;
__END__
<image href="images/cron1.png" />
<image href="images/cron2.png"> </image>
<image href="images/cron3.png">abc</image>
<image href="images/cron4.png" />
<image href="images/cron5.png"><alt><br /></alt></image>
<image href="images/cron6.png"><i /></image>
<image href="images/cron7.png"><alt>xyz</alt></image>
<image href="images/cron8.png"><alt><b>xyz</b>ijk</alt></image>
<image href="images/cron9.png">abc def</image>
Minor edits; changed selector from 'image > alt' to 'image alt' to find all descendants. Also: Comments are now not considered as content.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|