I am wanting to ignore entire subnets and tried 10.227.*;*;*;*, 10.227.*.*;*;*;*, and 10.227.0.0/16;*;*;* in the file used for USER_IGNORELIST. None worked and thus I had to use 10\.227\.\d+\.\d+ in IGNORE_EVENTS_REGEX
Having support for wildcards in the USER_IGNORELIST would help make looking and configuring the ignore lists faster and require less steps.