ruby Puppet 中的字符串替换？
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String substitution in Puppet?
提问by richardkmiller
Is it possible to do a string substitution/transformation in Puppet using a regular expression?
是否可以使用正则表达式在 Puppet 中进行字符串替换/转换？
If $hostname is "web1", I want $hostname_without_number to be "web". The following isn't valid Puppet syntax, but I think I need something like this:
如果 $hostname 是“web1”，我希望 $hostname_without_number 是“web”。以下不是有效的 Puppet 语法，但我想我需要这样的东西：
$hostname_without_number = $hostname.gsub(/\d+$/, '')
回答by freiheit
Yes, it is possible.
对的，这是可能的。
Check the puppet function reference: http://docs.puppetlabs.com/references/2.7.3/function.html
查看puppet函数参考：http: //docs.puppetlabs.com/references/2.7.3/function.html
There's a regular expression substitution function built in. It probably calls the same underlying gsub function.
有一个内置的正则表达式替换函数。它可能调用相同的底层 gsub 函数。
$hostname_without_number = regsubst($hostname, '\d+$', '')
Or if you prefer to actually call out to Ruby, you can use an inline ERB template:
或者，如果您更喜欢实际调用 Ruby，则可以使用内联 ERB 模板：
$hostname_without_number = inline_template('<%= hostname.gsub(/\d+$/, "") %>')
回答by user45949
In this page:
在此页面中：
https://blog.kumina.nl/2010/03/puppet-tipstricks-testing-your-regsubst-replacings-2/comment-page-1/
https://blog.kumina.nl/2010/03/puppet-tipstricks-testing-your-regsubst-replacings-2/comment-page-1/
it is quite well explained and there is a fantastic trick for testing your regular expressions with irb.
它解释得很好，并且有一个很棒的技巧可以使用 irb 测试您的正则表达式。
Whith this link and the answer of freiheit I could resolve my problem with substitution of '\' for '/'.
通过此链接和 freiheit 的答案，我可以通过将 '\' 替换为 '/' 来解决我的问题。
$programfiles_sinbackslash = regsubst($env_programfiles,'\','/','G')
$programfiles_sinbackslash = regsubst($env_programfiles,'\','/','G')
