Setting compare values with enumerations in the Trigger Setup window, has similar syntax to numeric compare values. The radix char is 'e'. Only the operators 'eq' and 'neq' are supported for enumeration compare values.
Figure 1. Enumerations in Trigger Setup Window
set_property TRIGGER_COMPARE_VALUE eq2'ethree [get_hw_probes U_SINEGEN/sel
-of_objects [get_hw_ilas -of_objects [get_hw_devices xc7k325t_0] -filter
{CELL_NAME=~"u_ila_0"}]]