Wildcards can be used in text search fields, but not as the first character.
To perform a single character wildcard search use the "?" symbol, e.g. "Lev?" will find Levi, Levy and any other name beginning with "Lev" with four characters, but won't find "Levey".
The multiple character wildcard * (asterisk) looks for any number of characters (or none) within the nominated text. "Lev*y" will find Levy and Levey. "S*war* " will find many variations of the name including Swartz, Schwartz, Schwarcz, Szwarc. "Davi*s" will find both Davis and Davies as well as Davidowits. "Lev*" will find any name beginning with "Lev", eg Levine, Levinstein, etc, as well as Levy, Levi and Levey.