This would be the reason then, that when I looked up the \w in the regex tutorials \w is mentioned as matching alphanumerics, underscores and others. That was just a quick look. After going back just now, I can see there is a lot of information peppered throughout the various regex tutorials relating to the encoding.
In the meantime, I have updated the Ascii \w in my post to include the numerics as well as the alphas. And added some links to perlsec and perlrequick.
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