Code:
$data1 =~ s/[^ 0-9A-Za-z]//g;
$data2 =~ s/[^ 0-9A-Za-z]//g;
$data3 =~ s/[^ 0-9A-Za-z]//g;
$data5 =~ s/[^0-9A-Za-z]//g;
$data6 =~ s/[^0-9]//g;
The last one will
only do what you asked, that is, it will also change "2.5+3.7=6.2" into "2.53.76.2".