On Saturday, 20 June 2020 at 01:35:56 UTC, Denis wrote:
THE OBJECTIVE
The objective is to read a file one line at a time (reading
each line into a string), while checking for human-readable
text character by character. Invalid characters (control and
UTF-8) should generate an exception.
Unless there's already an existing function that works as
described, I'd like to write one. I expect that this will
require combining an existing read-by-UTF8-char or read-by-byte
function with the additional validation.
It sounds like maybe what you are looking for is Unicode
character categories:
https://en.wikipedia.org/wiki/Unicode_character_property#General_Category
