templates: add match function

Add a match function that returns true if a string matches the provided
regular expression. The compiled regular expressions are cached in
a sync.Map to avoid repetitive compilations of the same expressions.

Caveat: if the user mixes the arguments order, it may cause the cache to
consume a lot of memory filled with garbage regular expression objects.
Ideally, we would need to limit the size of this cache and/or use a LRU
cache implementation. Maybe someday?

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

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