2 Times the Bible says he regretted something he done in the past and at least 15 places the Bible says he regretted or he might regret something that he might do in the future. Would he do it differently if he had another chance? Impassibility? John Piper answers

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"Two times the Bible says that God regretted something he had done in the past (Genesis 6:6–7; 1 Samuel 15:11). And in at least 15 places the Bible says he regretted, or that he might regret, something he was about to do in the future (Exodus 32:12–14; 2 Samuel 24:16; 1 Chronicles 21:15; Psalms 106:45; Jeremiah 18:8-10; 26:3, 13, 19; 42:10; Joel 2:13–14; Amos 7:3, 6; Jonah 3:9–10; 4:2)"

Jeremiah 18:8,10

and if that nation, concerning which I have spoken, turns from its evil, I will relent of the disaster that I intended to do to it...and if it does evil in my sight, not listening to my voice, then I will relent of the good that I had intended to do to it.

Romans 9:22 - 23 What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, in order to make known the riches of his glory for vessels of mercy, which he has prepared beforehand for glory—