policy: T4329: Fix regex for extcommunity rt #2

The previous implementation did not iterate over the communit list, so only
one match criteria was supported.

set policy route-map FOO rule 10 action 'permit'
set policy route-map FOO rule 10 set extcommunity rt '1111:2222222'

worked but on the other hand this failed:

set policy route-map FOO rule 20 action 'permit'
set policy route-map FOO rule 20 set extcommunity rt '6500:24 6500:23 192.168.0.1:111 192.168.0.1:222'

interface-definitions/include/policy/extended-community-value-list.xml.i

@@ -12,4 +12,4 @@
 </constraint>
 <constraintErrorMessage>Should be in form: ASN:NN or IPADDR:NN where ASN is autonomous system number</constraintErrorMessage>
 <multi/>
-        <!-- include end -->
+<!-- include end -->

src/validators/bgp-extended-community

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2019-2022 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2019-2023 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -28,28 +28,25 @@ if __name__ == '__main__':
     parser: ArgumentParser = ArgumentParser()
     parser.add_argument('community', type=str)
     args = parser.parse_args()
-    community: str = args.community
-    if community.count(':') != 1:
-        print("Invalid community format")
-        exit(1)
-    try:
-        # try to extract community parts from an argument
-        comm_left: str = community.split(':')[0]
-        comm_right: int = int(community.split(':')[1])
-
-        # check if left part is an IPv4 address
-        if is_ipv4(comm_left) and 0 <= comm_right <= COMM_MAX_2_OCTET:
-            exit()
-        # check if a left part is a number
-        if 0 <= int(comm_left) <= COMM_MAX_2_OCTET \
-                and 0 <= comm_right <= COMM_MAX_4_OCTET:
-            exit()
-
-    except Exception:
-        # fail if something was wrong
-        print("Invalid community format")
-        exit(1)
-
-    # fail if none of validators catched the value
-    print("Invalid community format")
-    exit(1)
+
+    for community in args.community.split():
+        if community.count(':') != 1:
+            print("Invalid community format")
+            exit(1)
+        try:
+            # try to extract community parts from an argument
+            comm_left: str = community.split(':')[0]
+            comm_right: int = int(community.split(':')[1])
+
+            # check if left part is an IPv4 address
+            if is_ipv4(comm_left) and 0 <= comm_right <= COMM_MAX_2_OCTET:
+                continue
+            # check if a left part is a number
+            if 0 <= int(comm_left) <= COMM_MAX_2_OCTET \
+                    and 0 <= comm_right <= COMM_MAX_4_OCTET:
+                continue
+
+        except Exception:
+            # fail if something was wrong
+            print("Invalid community format")
+            exit(1)