Only in simple concordance search, the asterisk (*) and question mark (?) can be used like this:
asterisk (*) stands for zero or more characters
test* will find
test, tests, tested, testing
c*t will find
CT, cut, cat, craft, construct
question mark (?) stands for exactly 1 character
test? will find
tests, Testa, testy
but will not find
c?t will find these lemmas
BUT! simple search always treats each search word as a lemma, thus c?t will search for the lemmas cut, cat and cot. These lemmas will produce results which include all word forms. The final concordance will thus show: cut, cutting, cat, cats, cot, cots, etc.
To search for the asterisk and question mark , use * and ?