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Regex Test mode

In order to ease regex development, we added a regex test mode to pihole-FTL which can be invoked like

pihole-FTL regex-test

(test against all regexs in the gravity database), or

pihole-FTL regex-test "(^|\.)double"

(test against the CLI-provided regex (^|\.)double.

You do NOT need to be sudo for this, any arbitrary user should be able to run this command. The test returns 0 on match and 1 on no match and errors, hence, it may be used for scripting.