Regeer (Haarlem, August 18, 2003) has played in Ajax's youth academy since 2017, having joined from ADO Den Haag’s youth academy. On December 15, 2021, he made his debut in the first team during the TOTO KNVB Cup match between Ajax – BVV Barendrecht: 4-0. The youth international has so far played twice for the first team and has scored once.
Regeer is also one of the captains of Jong Ajax. He made his debut on Feebruary 21, 2020 during the match between Helmond Sport – Ajax Reserves: 0-2. Since then, he has made 60 appearances for the reserves, scoring five times.