Possible Clues:

• Feels badly about
• Feels sorry for trick, we heard
• Regrets most sincere non drinker being thrown out
• Wants to take back
• Thinks of with buyer's remorse, say
• Regrets hoax that's broadcast
• Ways for Edith Piaf to show regrets
• Feels sorry for
• Has regrets over
• Bemoans and regrets