Here is something to get you started. Using Mojo::DOM, parse the HTML, match a single sentence then alter the DOM to do what you want:
#!/usr/bin/perl
use strict;
use warnings;
use Mojo::DOM;
# slurp in from file, or get using Mojo::UserAgent...
my $html = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//
+EN">
<html>
<body>
<p>This is sentence 1</p>
<p>This is <font color="#000000"><font face="Century Gothic, serif">se
+ntence 2</font></font></p>
<p>This is sentence 1. This is sentence <span style="font-weight: norm
+al">3</span> </p>
</body>
</html>';
# new Mojo::DOM
my $dom = Mojo::DOM->new( $html );
# for each p tag found
for my $e ( $dom->find('p')->each ){
# use the all_text method to get all of the visible text, including
+from
# descending tags. In this short example to get you started match a
+specific
# string.
if ( $e->all_text eq 'This is sentence 2' ){
# once we have a match, wrap the node around this:
$e->wrap_content('<sentence id="2"></sentence>');
}
}
# print to screen, do whatever you want with the results.
print $dom->content;
Produces:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body>
<p>This is sentence 1</p>
<p><sentence id="2">This is <font color="#000000"><font face="Century
+Gothic, serif">sentence 2</font></font></sentence></p>
<p>This is sentence 1. This is sentence <span style="font-weight: norm
+al">3</span> </p>
</body>
</html>
Now all you have to do is make this generic, but that's fairly trivial, and I'll leave that as an exercise for you.
See also Re: Batch remove URLs or Super Search for more examples.
Update: I assume the ordering of the second p/sentence tag here was a mistake, closing the p tag before the sentene:
<p><sentence id=”1”>This is sentence 1></sentence></p>
<p><sentence id=”2”>This is <font color="#000000"><font face="Century
+Gothic, serif">sentence 2</font></font></p></sentence>
<p><sentence id=”3”>This is sentence 1. </sentence><sentence id=”4”>Th
+is is sentence <span style="font-weight: normal">3</span></sentence><
+/p>
