| eval RouteLatency = if (Name="ABC" AND HTTP="*https://.net.*.com*" , bckLatency ,RouteLatency )
use "like" function
| eval RouteLatency = if (Name="ABC" AND like(HTTP,"%https://.net.%.com%") , bckLatency ,RouteLatency )
Either use match() to match with regex or searchmatch() to match "searchlike".