bug#16577: Add regexp-based version of completion-ignored-extensions

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> If you are talking about something we should concoct, then I don't
> think I see a problem expressing "match after / or at the start of the
> string" in the regexp notation.  So why were you asking about it?

I was asking whether we had it, because \\(:?\\`\\|/\\) is a handful to
type.

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