[DrCatbox]

The [[:print:]] will match any printable characters like åä, while the [ -~] will not.

I used this once as another safeguard against pushing binary data into the database. It was a poor system to begin with where you even have that possibility... and it happened at least once before the fix and my safeguard was in place.

[e12e]

"å" is perfectly valid text input in my locale.

[EvilTerran]

There will be situations where you need to check specifically for 7-bit ASCII printable characters only. I've worked with APIs that require everything outside that range to be escaped/encoded into it.

Email could be an example, I guess, although I haven't worked with it enough to know whether the whole "7-bits only" thing is still an issue these days.

[nowarninglabel]

I think that was his point, that he had a good use for :print: over just -~