|Full name||Paulo Roberto da Costa Regula|
|Date of birth||12 March 1989|
|Place of birth||Sarilhos Pequenos, Portugal|
|Height||1.84 m (6 ft 1⁄2 in)|
|2012–2013||→ Naval (loan)||35||(6)|
|2015||→ Litex Lovech (loan)||12||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 12 May 2017
After beginning to play football with Sporting Clube de Portugal, Regula moved to Vitória F.C. in 2002 at the age of 13, where he completed his formation. In the 2008–09 season he began to receive callups to the main squad, making his debut in the Primeira Liga on 24 January 2009, coming on as a 62nd-minute substitute in a 0–1 home loss against Associação Naval 1º de Maio.
Regula repeated individual numbers in the 2009–10 campaign, again appearing in 11 league games but managing to score once – in a 3–5 loss at F.C. Paços de Ferreira– as the Sadinos again retained their division status. On 11 November 2010 he suffered a serious injury to his fibula in a match against U.D. Leiria and, on 30 June 2011, as his contract expired, was released by the club.
After becoming a free agent, Regula was set to complete a transfer to Calcio Catania in Italy, with the move even being announced on 14 July 2011. However, shortly after the transfer collapsed, and he signed for S.C. Olhanense the following month.
- "Naval ganha em Setúbal e começa a "respirar" melhor" [Naval win in Setúbal and start to "breathe" better] (in Portuguese). Rádio e Televisão de Portugal. 24 January 2009. Retrieved 25 October 2017.
- "Paços de Ferreira continua em ascensão" [Paços de Ferreira still on the rise] (in Portuguese). SAPO. 28 February 2010. Retrieved 25 October 2017.
- "Paulo Regula saíu de maca e poder ter lesão no perónio esquerdo" [Paulo Regula was stretchered off and may have left fibula injury] (in Portuguese). SAPO. 14 November 2010. Retrieved 25 October 2017.
- "Ajuda do sindicato permite solução para 61% dos jogadores desempregados" [Union help allows a solution for 61% of the unemployed players]. Diário de Notícias (in Portuguese). 11 July 2017. Retrieved 25 October 2017.
- Gazzetta: Il Catania ha preso Paulo Regula (Gazzetta: Catania acquire Paulo Regula); Mondo Catania, 14 July 2011 (in Italian)
- Officiel: Paulo Regula à Catania (Official: Paulo Regula to Catania); Foot Goal, 26 July 2011 (in French)
- "Regula cedido à Naval" [Regula loaned to Naval]. Record (in Portuguese). 3 August 2012. Retrieved 25 October 2017.
- "Литекс официално привлече португалеца Регула" [Litex officially acquire Portuguese Regula] (in Bulgarian). Sportal. 23 February 2015. Retrieved 16 July 2016.