I would consider using a stack (a last on first off array). Everytime you find an open span tag push the attribute onto the stack. When you find a close span tag pop the attribute off the stack. You'll then know which attribute you are closing. If the stack runs out of attributes or if you have some left over you'll also know that the span tags weren't balanced :-)
Hope that helps.
Update:
I would _certainly_ use an HTML parser
Update 2:
Code added.
#!/usr/bin/perl
use warnings;
use strict;
use HTML::TokeParser::Simple;
my $html;
{
local $/;
$html = <DATA>
}
my @stack;
my %lookup = (
'font-weight: bold;' => 'b',
'font-style: italic;' => 'i',
'text-decoration: underline;' => 'u',
);
my $tp = HTML::TokeParser::Simple->new(\$html);
while (my $t = $tp->get_token){
if ($t->is_start_tag('span')){
my $attr = $t->get_attr('style');
my $tag = $lookup{$attr};
push @stack, $tag;
print "<$tag>";
next;
}
if ($t->is_end_tag('span')){
my $tag = pop @stack;
print "</$tag>";
next;
}
print $t->as_is;
}
__DATA__
this <span style="font-weight: bold;">is</span> some
<span style="font-weight: bold;">test
<span style="font-style: italic;">text</span>
<span style="text-decoration: underline;">for</span> bolding</span>,
+
underlining and italicizing text.<br />
Output
---------- Capture Output ----------
> "c:\perl\bin\perl.exe" _new.pl
this <b>is</b> some
<b>test
<i>text</i>
<u>for</u> bolding</b>,
underlining and italicizing text.<br />
> Terminated with exit code 0.
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-
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>
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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).
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