Controls whether or not channel filter values are sanitized by replacing any non letter or digit character with an '_'.

For example, if the channel key is specified as "/Orders/${Region}" and a filter of "Region=Asia/Pac" is given, then the filter will match all messages with the resolved key value of "/Orders/Asia_Pac" (rather than "/Orders/Asia/Pac").

This configuration setting does not typically need to be modified & only exists for certain rare edge cases.