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Validates a value against a supplied list, this is done case insensitively, and returns the version from the list, thus supplying a consistent version, that could be used as a link to a page.
| value =
| list =
| value_not_found =
| empty =
||Value to be validated.
||A comma separated list of valid values.
||Value to return (default) if the value is not found in the list.
||Value to be returned if the value is empty, or does not exist.