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Running regular expressions with capture groups is expensive. Bail out early if the line does not start with a '#'. This reduces the runtime of the check by two thirds. Signed-off-by: Ján Tomko <jtomko@redhat.com> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> Reviewed-by: Erik Skultety <eskultet@redhat.com>