[Bug 3143] New: Add the ability to capture wildcard portion of Host keyword in ssh_config

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3143

            Bug ID: 3143
           Summary: Add the ability to capture wildcard portion of Host
                    keyword in ssh_config
           Product: Portable OpenSSH
           Version: -current
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: lavneetpuri at gmail.com

Use Case:
`ssh pc-1` would connect to remote-cpu-1.domain.com

Currently we can use `%h` token but it captures the whole argument to
Host keyword (i.e pc-1). This feature would enable capturing just the
pc number (ie. 1) by using a new `%m` token for example. It is useful
to simplify connection to complex ssh hostnames

For the above use-case, the ssh config can be specified as follows:
Host pc-*
  Hostname remote-cpu-%m.domain.com

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