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   ssh_config    ( 5 )

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PATTERNS

A pattern consists of zero or more non-whitespace characters, '*'
     (a wildcard that matches zero or more characters), or '?' (a
     wildcard that matches exactly one character).  For example, to
     specify a set of declarations for any host in the ".co.uk" set of
     domains, the following pattern could be used:

           Host *.co.uk

     The following pattern would match any host in the 192.168.0.[0-9]
     network range:

           Host 192.168.0.?

     A pattern-list is a comma-separated list of patterns.  Patterns
     within pattern-lists may be negated by preceding them with an
     exclamation mark ('!').  For example, to allow a key to be used
     from anywhere within an organization except from the "dialup" pool,
     the following entry (in authorized_keys) could be used:

           from="!*.dialup.example.com,*.example.com"

     Note that a negated match will never produce a positive result by
     itself.  For example, attempting to match "host3" against the
     following pattern-list will fail:

           from="!host1,!host2"

     The solution here is to include a term that will yield a positive
     match, such as a wildcard:

           from="!host1,!host2,*"

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