TMTOWTDI -- Regexp::Common::number 
use Regexp::Common qw /number/;

while(<DATA>){
  chomp;
  print /\A$RE{num}{hex}\z/ ? 'YES' : 'NO ';
  print " $_\n";
}

__DATA__
12345
abc1234
foo123
ab123CD

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In reply to Re: hex-only regex by davidrw
in thread hex-only regex by dwhite20899

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