Check char range

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Check if text is valid ASCII or if it has surrogate pairs. Helpful to protect against phishing URLs and fingerprinted text, because it allows you to ensure no chars are "disguised".

If you're a flow developer, you can CP📋 the expressions used here, to perform input validation.

I used possessive quantifiers in the regex for better performance.

The issue with "Print" POSIX Char Class, is that it isn't 7b ASCII. More info here: groups.google.com/g/automate-user/c/-Tuegbe5DU8

Tags: zero-width confusable Unicode

LICENSE: https://unlicense.org