Regular expressions are supported with File Watcher jobs when the System Agent is at least at release: R11.3 SP1 CUMULATIVE 2
For example on Linux, patch RO55416 ( LNX- X86 CA WA AGENT R11.3 SP1 CUMULATIVE 2 ) has to be installed (or higher patch number because there are cumulative patches
A typical Job might be:
insert_job: TEST_FW1 job_type: FW
description: "FW test with regular expressions"