This seems definite:

Any version Before 5.12 Deterministic Behaviour Only in 5.12+
To match [0-9] /[0-9]/ /\d/ (sometimes)
/[[:digit:]]/ (sometimes)		 /\d/ (always) /\p{PosixDigit}/
To match a Unicode Digit /\p{Digit}/ /\d/ (sometimes)
/[[:digit:]]/ (sometimes)

I don't know what's going to happen to /[[:digit:]]/.

It's not clear (if it's been decided) if the deterministic behaviour will be active by default in 5.12+, or if a pragma (use 5.012;) will activiate it.

If the deterministic behaviour will be active by default in 5.12+, there may be a pragma to deactivate it.

In reply to Re^3: Regarding the new \w regexp escape in 5.11 by ikegami
in thread Regarding the new \w regexp escape in 5.11 by kappa

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