Teatro de Cámara de Múnich
Regnier's first engagement was in 1938 at the theatre at Greifswald, where he met actress and singer Pamela Wedekind, a daughter of the playwright Frank Wedekind. They married on 21 June 1941 in Berlin. In 1941, Regnier was invited by Otto Falckenberg to join the ensemble of the Munich Kammerspiele, where he remained until 1958. From 1946, Regnier worked as a drama teacher at the newly founded Otto-Falckenberg-Schule.