Sir James wasn't sure why he felt a vague regret.

The pheromone-rich air stitched a vague regret into my guts and groin.

This warrants more than vague regret.

Too, he felt a vague regret that Franklin had no Di, no Ellen, with whom to share what already seemed the dawning of a new age.

Then she might learn to forget him, or, at the worst, to remember him with but a vague regret.

It was an enormous moment, this good-bye to the old home; so enormous she could hardly grasp it, could feel only a vague regret.

Seeing Anna, he experienced a vague regret.

He felt a vague regret, but he quickly shunted it aside.

He hurried down the ramp, leaving a vanishing vague regret.

He felt a vague regret - he had sort of liked Gardener.