よかったなあ

I wish I had; I'm glad

→ 良い
phrase Rare #40,391
I wish I had; I'm glad With 〜ればよかったなあ, it expresses regret that something was not done: “I wish I had done it.” With 〜なければよかったなあ, it expresses regret that something was done: “I wish I hadn’t done it.” It can also express relief or satisfaction, meaning “I’m glad.” なあ adds an emotional, reflective tone.
JA: もっと早く予約すればよかったなあ。
EN: I wish I had made the reservation earlier.

あんなに恐ろしい映画は見なければよかったなあ

I wish I hadn't watched such a terrifying movie.

やっぱお前と桐山入れといてよかったなあ

I'm really glad I put you and Kiriyama in after all.

— バトル・ロワイアル (2000)

自転車で来ればよかったなあ

I wish I’d come by bike.