Cisco IOS show vlans sometimes return extra whitespaces that breaks parsing

[gertzakis]

ISSUE TYPE

• Template Issue with error and raw data

TEMPLATE USING

Value Required VLAN_ID (\d+)
Value List INTERFACES ([\w\./-]+)
Value List IP_ADDRESSES (\S+)
Value List IPV6_ADDRESSES (\S+)

Start
  ^VLAN\s+ID:\s+${VLAN_ID} -> Data
  ^Virtual\s+LAN\s+ID\:\s+${VLAN_ID} -> Data
  ^No\s+Virtual\s+LANs\s+configured
  ^\s*$$
  ^. -> Error

Data
  ^Virtual\s+LAN\s+ID\:\s+\d.* -> Continue.Record
  ^Virtual\s+LAN\s+ID\:\s+${VLAN_ID}.*
  ^VLAN\s+ID:\s+\d+ -> Continue.Record
  ^VLAN\s+ID:\s+${VLAN_ID}
  ^\s+This\s+is\s+configured\s+as\s+native\s+Vlan\s+for\s+the\s+following\s+interface\(s\)\s+:\s*$$
  ^\S+(\s+Native-vlan\s+Tx-type:\s+\S+)?\s*$$
  ^\s+Protocols\s+Configured
  ^\s+IP\s+\d+\s+\d+
  ^\s+MPLS\s+\d+\s+\d+
  ^\s+MPLS\:\s+\S+
  ^\s+[vV]LAN\s+Trunk\s+Interfaces?\:\s+${INTERFACES} -> Interface
  ^VLAN\s+trunk\s+interfaces -> Interface
  ^[\w\./]+\s*$$
  ^${INTERFACES}\s+\(\d+\)\s*$$
  ^\s+IP:\s+${IP_ADDRESSES}\s*$$
  ^\s+IP\s+${IP_ADDRESSES}\s+
  ^\s+IPv6:\s+${IPV6_ADDRESSES}\s*$$
  ^\s+IPv6\s+${IPV6_ADDRESSES}\s+\d+\s+\d+
  ^\s+Other\s+
  ^\s+IPv6\s+\d+\s+\d+
  ^\s+Total\s\d+
  ^\s+\d+\s+packets,
  ^\s*$$
  ^. -> Error Data

Interface
  ^\s*${INTERFACES}\s*$$
  ^\s*\S+\s+\(\S+\)$$
  ^\s+Total\s+\d+\s+
  ^\s+IP\:\s+${IP_ADDRESSES}
  ^\s+IPv6\:\s+${IPV6_ADDRESSES}
  ^\s+MPLS\:\s+
  ^\s+Protocols\s+Configured\: -> Data
  ^\s+This\s+is\s+configured\s+as\s+native\s+Vlan -> Data
  ^Virtual\s+LAN\s+ID\:\s+\d.* -> Continue.Record
  ^Virtual\s+LAN\s+ID\:\s+${VLAN_ID}.* -> Data
  ^VLAN\s+ID:\s+\d+ -> Continue.Record
  ^VLAN\s+ID:\s+${VLAN_ID} -> Data
  ^. -> Error Interface

SAMPLE COMMAND OUTPUT

Please notice the extra white spaces & tabs at the empty line between "vLAN Trunk Interface" and "Protocols Configured".

Virtual LAN ID:  1280 (IEEE 802.1Q Encapsulation)

   vLAN Trunk Interface:   GigabitEthernet9.1280
          
   Protocols Configured:   Address:              Received:        Transmitted:

GigabitEthernet9.1280 (1280)
           IP              10.49.14.129                 0                   0
        Other                                           0                   2

   0 packets, 0 bytes input
   2 packets, 92 bytes output

SUMMARY

The extra white spaces break the parsing of the command.

STEPS TO REPRODUCE

EXPECTED RESULTS

The output to be parsed without any issues and get data.

ACTUAL RESULTS

Parsing failed with the below error.

"Error: Interface. Rule Line: 52. Input Line:           ."