This method of the IncludeExcludeWildcards Class retrieves the WildcardExpression object that specifies the strings that are excluded from the set.
public WildcardExpression getExcludeExpression();
Returns the WildcardExpression object that specifies the strings that are excluded from the set. If the IncludeExcludeWildcards object was created with a null exclude parameter and the exclude method has not been called, the method returns null.