Add comment for regex

src/azure-cli/azure/cli/command_modules/acs/_validators.py

@@ -745,6 +745,8 @@ def validate_allowed_host_ports(namespace):
     if not host_ports:
         return
 
+    # Parse the port range. The format is either `<int>/<protocol>` or `<int>-<int>/<protocol>`.
+    # e.g. `80/tcp` | `22/udp` | `4000-5000/tcp`
     regex = re.compile(r'^((\d+)|(\d+-\d+))/(tcp|udp)$')
     for port_range in host_ports.split(","):
         found = regex.findall(port_range)

src/azure-cli/azure/cli/command_modules/acs/agentpool_decorator.py

@@ -1284,6 +1284,8 @@ def get_allowed_host_ports(self) -> Union[List[PortRange], None]:
         ports = ports.split(',')
         port_ranges = []
         import re
+        # Parse the port range. The format is either `<int>/<protocol>` or `<int>-<int>/<protocol>`.
+        # e.g. `80/tcp` | `22/udp` | `4000-5000/tcp`
         regex = re.compile(r'^((\d+)|((\d+)-(\d+)))/(tcp|udp)$')
         for port in ports:
             r = regex.findall(port)