----- Original Message -----
> From: "Robert Poulson" <robpo...@gmail.com>
> To: "puppet-users" <puppet-users@googlegroups.com>
> Sent: Thursday, 4 August, 2016 16:42:21
> Subject: Re: [Puppet Users] Re: Puppet .... ruby regex
>>
>> $pp_shortcertname= "${trusted['certname']}".match(/([^.]+)\./)[1]
>>
>> not sure I fully understand why this works and [] doesn't.
>>
>> Not 100% sure I understand what the [1] does !
>>
>
> The parentheses are for capturing the matching text, and \1 for re-using it
> as a backreference; [1] outside of the pattern.
>
> See http://ruby-doc.org/core-2.1.1/Regexp.html#class-Regexp-label-Capturing
this is not a ruby question, the code in question is PUPPET DSL.
The DSL match function looks for a regex and returns what it finds and any
capture groups.
You access the 2nd item in the array as array[1]
if certname if hostname.domain.name
$matches = $trusted["certname"].match(/([^.]+)\./)
Here $matches will have ["hostname.", "hostname"]
and $matches[1] will fetch "hostname"
https://docs.puppet.com/puppet/latest/reference/function.html#match
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