They changed at one point; IIRC it used to be something like (?p{...}); I think Ilya originally envisioned it as a limited scope version of a hypothetical qr/foo$bar/p that would at match time use the current value of $bar.

In reply to Re^3: Named capture backreferences cannot be used in character classes? by yitzchak
in thread Named capture backreferences cannot be used in character classes? by BrowserUk

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