Looking on the internet deeply has found these results:

He regrets is the most popular phrase on the web.

He was regretful 120,100 results on the web	He regrets 11,190,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I will, for the rest of my life, live with a regretful heart. It's really regretful but in any case... It is regretful, what happened to Varro. I've been feeling regretful about something I said. But it will also be your most regretful decision. Concerning security measures taken during ground and sea transport of radioactive and nuclear materials, it is regretful that no Community legislation exists in this field. Christ, protect these regretful sinners... and make them as your bride, in your name. The team thinks it plays best if we see them as two young people in love, regretful for their choices, but laughing it off.	He regrets that his actions were confusing. So he regrets certain things he has done. He regrets it later and begs me to forgive me. He made a mistake, he regrets it. He regrets that his actions were confusing. Tell Fitz he has 36 hours to convince me, in person, that he regrets the unfortunate choices he's made and truly wants to recommit himself to his wife and children. He regrets the cruelty of his last voice message. He regrets taking me in, doesn't he?

He was regretful

120,100 results on the web

He regrets

11,190,000 results on the web

More popular!

I will, for the rest of my life, live with a regretful heart.
It's really regretful but in any case...
It is regretful, what happened to Varro.
I've been feeling regretful about something I said.
But it will also be your most regretful decision.
Concerning security measures taken during ground and sea transport of radioactive and nuclear materials, it is regretful that no Community legislation exists in this field.
Christ, protect these regretful sinners... and make them as your bride, in your name.
The team thinks it plays best if we see them as two young people in love, regretful for their choices, but laughing it off.

He regrets that his actions were confusing.
So he regrets certain things he has done.
He regrets it later and begs me to forgive me.
He made a mistake, he regrets it.
He regrets that his actions were confusing.
Tell Fitz he has 36 hours to convince me, in person, that he regrets the unfortunate choices he's made and truly wants to recommit himself to his wife and children.
He regrets the cruelty of his last voice message.
He regrets taking me in, doesn't he?