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2d4c367d87
For `Lowercase`, `KeepEqual`, etc., we do not expand a regexp, so
the target label name must not contain anything like `${1}`.
Also for the common case that the `Replace` target does not require any
template expansion, check that the entire string passes label name
validity rules.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>