for _, wh := range validating.Webhooks {
		for _, mc := range wh.MatchConditions {
			preexisting.matchConditionExpressions.Insert(mc.Expression)
		}
	}
	return preexisting
}

func findValidatingPolicyPreexistingExpressions(validatingPolicy *admissionregistration.ValidatingAdmissionPolicy) preexistingExpressions {
	preexisting := newPreexistingExpressions()
	for _, mc := range validatingPolicy.Spec.MatchConditions {