Public bug reported:

A user just posted to #ubuntu the regex
'[ugoa]*([-+=]([rwxXst]*|[ugo]))+', asking for an explanation.

The regex appears in the chmod manpage, in isolation, without the
remotest explanation (or even an explanation that it is, in fact, a
regex). A path-expression-type version appears towards the top of the
manpage, along with detailed explanation. Surely that's confusing?

I would like this to be removed entirely from the manpage...

Unsure whether upstream would be interested... but it hardly seems
appropriate for Ubuntu.

** Affects: coreutils (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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Ugly, redundant and confusing regular expression in chmod manpage
https://launchpad.net/bugs/55991

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