He mixed with the greats of the game in the early years of the modern era - Eric Bristow, John Lowe, Bobby George - and while his career came to an end before televised darts became the norm, many of the first superstars cite him as an influence.
His time with London also coincided with a golden era of visiting international squads for challenge matches, including representative games with the United States and Sweden.
Following his third win, he was invited to appear on the 1972 Christmas edition of the television show Record Breakers alongside Tom Barrett and Bill Duddy.
With his most successful period coming just before the launch of the modern major tournaments, his appearance in the 1976 World Masters stands alone as his contribution to these events.
He reached the quarter-final of the World Masters that year, beaten by eventual winner John Lowe of England,[12] by a score of 3–2.
Third place at the 1979 British Open Pairs appears his last recorded darts honour in the UK, playing with Gary Laurence.
At the 1980 Golden Gate Dart Classic he reached the final of the mixed triples with Judy Campbell and Jack Radigan, being beaten only by Eric Bristow, Maureen Flowers and Leighton Rees.
[13] He has been noted as one of the founders of the darts exhibition circuit, travelling around the UK and North America playing the best local players and demonstrating trickshots.
Bobby George notes in his autobiography that O'Regan was chosen to captain the first ever English team in a recognised international game in 1973.