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Describe the groupname[x]/[x:y] syntax in more detail

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Abhijit Menon-Sen 2015-08-14 07:14:42 +05:30
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docsite/rst/intro_patterns.rst
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@ -68,13 +68,19 @@ It's also ok to mix wildcard patterns and groups at the same time::
one*.com:dbservers
As an advanced usage, you can also select the numbered server in a group::
webservers[0]
You can select a host or subset of hosts from a group by their position. For example, given the following group::
Or a range of servers in a group::
[webservers]
cobweb
webbing
weber
webservers[0:25]
You can refer to hosts within the group by adding a subscript to the group name:
webservers[0] # == cobweb
webservers[-1] # == weber
webservers[0:1] # == webservers[0]:webservers[1]
# == cobweb:webbing
Most people don't specify patterns as regular expressions, but you can. Just start the pattern with a '~'::