As a professional, she has boxed in the Jr. Flyweight, Flyweight, Jr. Bantamweight, Bantamweight and Featherweight divisions. Halmich has been the WIBF's world champion at the Jr. Flyweight, Flyweight and Featherweight division. Halmich made her profe

As a professional, she has boxed in the Jr. Flyweight, Flyweight, Jr. Bantamweight, Bantamweight and Featherweight divisions. Halmich has been the WIBF's world champion at the Jr. Flyweight, Flyweight and Featherweight division. Halmich made her professional debut on March 4, 1994, in her hometown of Karlsruhe, defeating Fienie Klee of the Netherlands.

Regina Halmich has defeated several quality boxers along her career. She defended her Flyweight title with success against Delia Gonzalez, Yvonne Caples and numerous others, once only with a draw against Elena Reid. She also faced Daisy Lang, against whom she won in a fight for the vacant IWBF world Super Flyweight title.

On January 15, 2005, she defeated Marylin Hernandez by a ten round unanimous decision defending the world Flyweight title. On April 16, 2005 she also defeated Hollie Dunaway in ten rounds defending her title. In her 50th professional fight, she has defended the title against Maria Jesus Rosa from Spain. S