If you don't travel now, you might 'live to regret it'. [=you might feel sorry or disappointed about it in the future]
We 'regret' to inform you [=we are sorry to tell you] that we have offered the job to someone else.
It is to be 'regretted' [=it is regrettable/unfortunate] that the program has lost its funding.
(..) My Lady! can How dare you just a lady to treat '? Very soon, they will play in it because with your head cut off. you regret difficult still. Do you really think I will submit you? You'll have to. me and the sword, forged by the old gods personally. from your gods, not mine (..)2011 The Dragon Warrior