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"regretting" is also used as a crossword clue. If that's what you saw, the answer is often ruing (5 letters).
Definitions
Feeling sorry or remorseful about something past.
Used in a sentence
“And for all I then declined / O the regrettings infinite / When the night-processions flit / Through the mind!”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Sorry now”10 letters
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