Programming Perl, 4th Edition

hex

hex EXPR
hex

This function interprets EXPR as a hexadecimal string and returns the equivalent decimal value. A leading “0x” is ignored, if present. To interpret strings that might start with any of 0, 0b, or 0x, see oct. The following code sets $number to 4,294,906,560:

$number = hex("ffff12c0");

To do the inverse function, use sprintf:

sprintf "%lx", $number;         # (That's an ell, not a one.)

Hex strings may represent integers only. Strings that would cause integer overflow trigger a warning. Unlike oct, leading whitespace is not stripped.