From their webpage :
Use advanced wildcard characters to find or replace text.
*
Any string of characters eg R*n will match Ron, Ran, Roan etc. and 'Bro*' it will match any word starting with Bro e.g. Brooks, Bromley, Bros.
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?
Replace a single character eg R?n will match Ron, Ran etc. It will not match Roan.
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@
Represents a soundex eg @colin will match Clune, Colan, Cullan, Callahan.
JM