m#/usr/(prot([^/]|$)|pro([^t]|$)|pr([^o]|$)|p([^r]|$)|[^p]|$)#

(updated)

                - tye

In reply to Re: Negative Lookahead using negated character classes? (|) by tye
in thread Negative Lookahead using negated character classes? by Wonko the sane

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