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Perl 5 version 12.2 documentation
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Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage

- hex EXPR

- hex

  Interprets EXPR as a hex string and returns the corresponding value. (To convert strings that might start with either `0` , `0x` , or `0b`, see oct.) If EXPR is omitted, uses `$_` .

          print hex '0xAf'; # prints '175'    print hex 'aF';   # same

  Hex strings may only represent integers. Strings that would cause integer overflow trigger a warning. Leading whitespace is not stripped, unlike oct(). To present something as hex, look into printf, sprintf, or unpack.