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Hi perl-diddler,

By the way, Perl's internal API function that decides whether a string looks like a number is exposed by Scalar::Util's looks_like_number:

use Scalar::Util qw/looks_like_number/;
print looks_like_number("65"   )?"yes":"no", "\n"; # yes
print looks_like_number("0x41" )?"yes":"no", "\n"; # no
print looks_like_number( 0xA_A )?"yes":"no", "\n"; # yes
print looks_like_number("0xA_A")?"yes":"no", "\n"; # no
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In the second-to-last example, the literal 0xA_A becomes 170, which of course looks like a number.

Regards,
-- Hauke D

In reply to Re: why are hex values not numbers? by haukex
in thread why are hex values not numbers? by perl-diddler

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