my $text = '1 + 2
+ dfdf';
my $output = "";
while ($text =~ m/((.*?<\/maths>)|([^<]*))/gs) {
if ($2) {
$output .= $2;
} else {
my $segment = $3;
$segment =~ s/+/ + /g;
$output .= $segment;
}
}
print $output . "\n";
__END__
1 + 2 br> + dfdf