Perl pattern match a hexadecimal number


How can I extract the following value, 0xF and 9.

$line="This is a hexadecimal number 0xF";
$line="This is a hexadecimal number 9";

I want to be able to extract 0xF and 9 via pattern matching even though the 9 does not have a 0x in front of it.  

I would like to be able to store the hexadecimal number in a perl variable such as $1.
Maybe something like this:
$line=~/This is a hexadecimal number (?)/;
print "The hexadecimal number is $1;

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$line=~/This is a hexadecimal number (\w+)/;

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