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[edited by: phranque at 2:29 am (utc) on Oct 4, 2017]
[edit reason] fixed typo [/edit]
Well since you didn't identify who is "allowed" then that's why your site crashed...
some incomplete regex directivesWas something edited out of the initial post before I saw it? I see neither a Regular Expression nor a wrapper. The argument in a Deny or Allow line isn't a regex, the way it would be in mod_setenvif.
to override a server-wide setting for auto-indexing (common in shared hosting).