 with the exception that the <a href=https://istio.io/v1.4/docs/reference/config/security/istio.authentication.v1alpha1/#StringMatch><code>regex</code> field</a>
is no longer supported.</p><h2 id=migration-flow>Migration flow</h2><p>This section describes in detail how to migrate a <code>v1alpha1</code> security policy.</p><h3 id=step-1-find-related-policies>Step 1: Find related policies</h3><p>For each namespace, find all <code>v1alpha1</code> security policies that have an effect on workloads in the names