zažaliti

1. to regret; to be sorry
   Zažalićeš što nisi pošao s nama. — You'll regret not coming with us.
   Odmah sam zažalio zbog tih reči. — I immediately regretted those words.
2. (za + instr.) to begin to miss; to grieve for
   Zažalio je za starim životom. — He began to miss his old life.

Used with zbog + gen. or a što-clause (zažaliti zbog odluke, zažaliti što…); in the sense 'to miss, to grieve for' — with za + instr. (zažaliti za mladošću).