20 Minutes: Regular Expressions IV

    while(<DATA>) {
        s/\d\d/  /g;
        s/(\w)\s(\w)/$1#$2/g;
        s/\w/#/g;
        print;
    }
    __DATA__
    F0 13 1D 31 AB 5F 00 FE 80  7E 33  D0 1B C2
    8A 07 B3 70 C6 21 98 D7 73  FE 42  7E 34 4C
    3A D7 4F 32 1F 0D 80 1A 44  D8 72  5A 30 D1
    FF 01 7E 03 D0 33 17 3B 38  7A 90  E4 71 D6
    0D 88 D0 48 DF 8D 13 0D D0  3C 0E  7F BB FE