You simply forgot to return $txt. A sub returns the result of the last statement by default, in your case this is the substitution. Try this instead:
#!/usr/local/bin/perl -w
use strict;
my $txt="This is a line\nThis is a line as well\n\nThis is the last li
+ne\n";
print ubb_txt($txt);
sub ubb_txt {
my $txt = shift;
return "" unless ( defined $txt);
my ($nl)=$txt =~ m{(\cM?\cJ)};
$txt =~ s{$nl$nl}{</p><p>}gs if (defined $nl);
$txt =~ s{$nl}{<br>}gs if (defined $nl);
return $txt;
}
__END__
This is a line<br>This is a line as well</p><p>This is the last line<b
+r>
Your sub was returning the number of substitutions made (i.e. the result of the last substitution).
CU Robartes-
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