I think meaning of /o in regexes is a good place for further reading - I came across it after my previous post.
It looks like qr// is preferred over /o (according to tye over there) - much of my perl knowledge is from 5.004, and I don't think qr// was available then...
sigh... I have a lot of catching-up to do. I guess that's a Good Thing.
Now you'll all excuse me while I read up (in perlop under 'Quote and Quote-like Operators') on qr// ...
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