Ought to do the @ as well, I suppose. Not sure about the &?

Neither am I. We could start a long discussion here involving eg quotemeta. But I suggest that we go no further down this line, and just accept to follow Corion's excellent advice above :

...it is a much saner approach to only allow what is permitted instead of rejecting what you know is bad.

In reply to Re^4: Regex and negative file test by Not_a_Number
in thread Regex and negative file test by neilwatson

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