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The straightforward way of doing bash substitution for optional strings leaves a pair of space characters, which the kvm.sh --kconfig option rejects as ill-formed. This commit therefore changes the corresponding regular expression to accommodate more than one space character between successive Kconfig options. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>