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Regan Smith (born February 9, 2002) is an American swimmer. She competed in the women's 200 metre backstroke event at the 2017 World Aquatics Championships. She also won gold in the 100 m backstroke at the FINA World Junior Swimming Championships in record breaking fashion, breaking Missy Franklin's 15-16 NAG record, as well as the world junior record, previously set by Taylor Ruck in the semis.