Translate 0 oder 1 Treffer from German to English

– A menu item that allows the user to search for a pattern A to be represented in pattern B 0 or 1 times. Patterns could be strings, characters, etc. For example, if you want to find any strings that meet the criteria " AB 0 or 1 matches in string", then "CCC", "ABC" meet the criteria, while "ABCAB" doesn't meet. ¹