config: avoid a funny sentinel value "a^"
Introduce CONFIG_REGEX_NONE as a more explicit sentinel value to say "we do not want to replace any existing entry" and use it in the implementation of "git config --add". Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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