'Regret' in the Bible

“I regret that I made Saul king, for he has turned away from following Me and has not carried out My instructions.” So Samuel became angry and cried out to the Lord all night.

Moreover, the Glory of Israel will not break faith and will not regret, for he [is] not a human that he should regret."

And later, David was full of regret for cutting off Saul's skirt.