Is the word regras the same in Brazilian and European Portuguese?

Yes

The word "regras" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference lies in pronunciation. In Brazil, the vowels are generally more "open" and clearly articulated. In Portugal, the rhythm is more stress-timed, and unstressed vowels (like the "e" in "regras") are often reduced or shortened, which makes the word sound more "clipped" or swallowed.

Brazilian Portuguese

1. É importante seguir as regras. (It is important to follow the rules.)
2. A gente não pode quebrar as regras do jogo. (We can't break the rules of the game.)
3. Quais são as regras da empresa? (What are the company rules?)
4. Ele sempre respeita todas as regras. (He always respects all the rules.)
5. As regras de trânsito mudaram. (The traffic rules have changed.)

Continental Portuguese

1. É importante cumprir as regras. (It is important to comply with the rules.)
2. Não podemos quebrar as regras do jogo. (We cannot break the rules of the game.)
3. Quais são as regras da empresa? (What are the company rules?)
4. Ele respeita sempre todas as regras. (He always respects all the rules.)
5. As regras de trânsito foram alteradas. (The traffic rules were changed.)