Interprets EXPR as a hex string and returns the corresponding numeric value. If EXPR is omitted, uses$_.
print hex '0xAf'; # prints '175'print hex 'aF'; # same$valid_input =~ /\A(?:0?[xX])?(?:_?[0-9a-fA-F])*\z/A hex string consists of hex digits and an optional0x orx prefix. Each hex digit may be preceded by a single underscore, which will be ignored. Any other character triggers a warning and causes the rest of the string to be ignored (even leading whitespace, unlikeoct). Only integers can be represented, and integer overflow triggers a warning.
To convert strings that might start with any of0,0x, or0b, seeoct. To present something as hex, look intoprintf,sprintf, andunpack.
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