"Bedauern" is the German word for "regret". much to my regret > sehr zu meinem Bedauern.
Also "Bereuen"
You will regret that > Das werden Sie Bereuen.
The choice is dependent on the intended meaning of the sentence.
The German word for how is wie.
und is and in German
The German word for Why is Varrum
"No remorse no regrets" translates as "Keine Reue, kein Bedauern"
Ich
sind
Wo.
mien
zu
The German word for "book" is "Buch"
At can be translated as an, bei or auf in German.
The German word for mother is Mutter.