Like cache size, user wildcards are also defined in application's configuration file.
Example:
For file discRack.conf part of code for user wildcards can look like:
#
# User wildcards
#
DatabaseManager.DB.User.userWildcard = "*"
DatabaseManager.DB.User.userSingleWildcard = "_"
DatabaseManager.DB.User.userSingleWildcardEscape = "$"
DatabaseManager.DB.User.userWildcardEscape = "$"