Regan's films are often characterised, as The Guardian describes, focusing "on working-class communities and characters.

[4] She started filming music promos when she was 15, going on to direct more than 200 of them,[4] including for Mumford & Sons ("Beloved")[6] and for Stereophonics ("Fly Like an Eagle").

[7] Regan graduated from Ravensbourne University London in 2016 with a Bachelor of Arts (BA) in Digital Film Production.

[9] In 2017, Regan was talent-spotted by Michael Fassbender’s production company, Finn McCool Films.

Scrapper premiered at the 2023 Sundance Film Festival, where it won the Grand Jury Prize for the World Cinema Dramatic Competition.