[2] Regnault studied philosophy at the Lycée Louis-Le-Grand, and then the Ecole Normale Supérieure (ENS) beginning in 1962[3] where he attended the seminars of Louis Althusser.
At ENS, he attended the seminars of Jacques Lacan and was a member of the editorial board of Cahiers pour l'Analyse beginning with its inception in 1966.
[3] Regnault taught at the Lycée de Reims from 1964–70, where he became a close friend of another philosopher and playwright, Alain Badiou.
In 1970, Regnault joined the Department of Philosophy (headed by Michel Foucault) at the then newly founded University of Paris VIII (Vincennes).
[3] Working as a theorist, dramaturg, and playwright, Regnault also co-directed the Théâtre de la Commune at Aubervilliers from 1991 to 1997, and from 1994 to 2001 he taught diction at the Conservatoire National d’Art dramatique in Paris.