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The parentheses in this regular expression should be doubly escaped because they undergo expansion twice. Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com> [stefano: fix commit message] Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org>