I'm not sure why that's not working for you, actually...
it looks like it would, from what I can tell, and from the
little test I did.
But anyway, depending on how complicated your text is,
you may need something more powerful than just a regex.
Take a look at HTML::FromText,
which formats your text into HTML. It can handle a lot
more formatting issues than just paragraphs.
use HTML::FromText;
my $str = <<TEXT;
Foo is on this line,
and bar is in this paragraph.
Baz is in a new paragraph.
TEXT
print text2html($str, paras => 1);
The result:
<P>Foo is on this line,
and bar is in this paragraph.</P>
<P>Baz is in a new paragraph.</P>
If you decide to go with a regex, I've always just used
$str =~ s/\n\n/<p>\n\n/g;
$str =~ s/\n/<br>\n/g;
which first replaces double-newlines and makes them
paragraphs, and then formats line breaks. Plus it keeps
the newlines there as a visual distinction, in case anyone
actually needs to *read* the HTML. :)
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