Well both examples create an odd thing:
<br>
FOO<br>
BAR<p><br>
<br>
BAZ<p><br>
<br>
notice the extra break tags?
where as a set of expressions will do the job like this:
$text = <<TEXT;
FOO
BAR
BAZ
TEXT
$text =~s/\n{2,2}/<p>/g;
$text =~s/\n{1,1}/<br>/g;
$text =~ s/</\n</g;
$text =~ s/>/>\n/g;
print $text;
gives us this result
FOO
<br>
BAR
<p>
BAZ
<br>
which i think is a little more of what you are looking for. I would suggest looking at the Regular Expressions book by O'Reilly. I left out some optimizations so you could go hunting for them.
take care
little_mistress@mainhall.com
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