Presumably to pursue a long career of regretting that he left a lead role on the best show on network television.
It's better to regret not having kids then having them and regretting it.
This is a crying evil: a bad state of things; and in regretting it, we must not lay the blame wholly on the opposite sex.
But as it has gone so far, and it is necessary for us to act, it is of no use shrinking or regretting.
According to Barbour, he made no answer, only regretting the breaking of his good axe-shaft.
Ever since he had been a master-printer on his own account, he had been regretting the fact.
Did the lover look back, regretting the broken word, the wrong done to another?
At every hour, he had to listen to his wife praising and regretting her first husband.
Sivel gathered these particulars during his stay at Canterbury, regretting the proceedings of Laurentius.
You will be regretting by now that you did not kill me too, as I invited you on that occasion.
"to look back with distress or sorrowful longing; to grieve for on remembering," late 14c., from Old French regreter "long after, bewail, lament someone's death; ask the help of" (Modern French regretter), from re-, intensive prefix (see re-), + -greter, possibly from Frankish or some other Germanic source (cf. Old English grætan "to weep;" Old Norse grata "to weep, groan"), from Proto-Germanic *gretan "weep." "Not found in other Romance languages, and variously explained" [Century Dictionary].
Related: Regretted; regretting. Replaced Old English ofþyncan, from of- "off, away," here denoting opposition, + þyncan "seem, seem fit" (as in methinks).
"pain or distress in the mind at something done or left undone," 1530s, from the verb, or from Middle French regret, back-formation from regreter (see regret (v.)).