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

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Oh, so this wouldn't be a plain regexp, but a ... mini-language where
> "/" has a special meaning?  I think that sounds pretty confusing.

By the way, it'd be nice to have a zero-width regexp matcher for "start
of file name component" (i.e., match after "/" or at the start of the
string).  We don't have that already anywhere, by any chance?

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