Lowercase variable values in Puppet

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http://serverfault.com – In my puppet config I need to lowercase a variable value before using it in a template. How to achieve this? Is there a way to lowercase a variable value inside the puppet manifest? Do I need to do this in the template? And more general: where are string manipulation functions that I could use in manifests. Do I have to write my own custom ruby functions to achieve this? (HowTos)