An expression of regret
[DOC] [TLE] Feelings of Remorse & The Perfect Apology [PAR] What's remorse: How to show and express it, the differences from regret, and 
their ... On the other hand, expressing remorse and genuine sorrow for the pain... [DOC] [TLE] Regret | Define Regret at Dictionary.com [PAR] Regret definition, to feel sorrow or remorse for (an act, fault, disappointment, etc.