Refer to the exhibit. A network administrator is troubleshooting BGP configuration and wants to display only routes that originated in AS 40. Which regular expression should the administrator use in the command show bgp ipv4 unicast regex regex-pattern ?
- show bgp ipv4 unicast regex ^40_
- show bgp ipv4 unicast regex *40_
- show bgp ipv4 unicast regex _40$ ????
- show bgp ipv4 unicast regex .40.
Explanation: In troubleshooting BGP, regular expressions (regex) can be used to parse through the large number of available ASNs. Regular expressions are based on query modifiers used to select the appropriate content. The regex pattern 100_ indicates to only include the lines that contain the exact phrase of 100. Some regex query modifiers are as follows:
(underscore) – Matches a space
^ (caret) – Indicates the start of a string
$ (dollar sign) – Indicates the end of a string
. (period) – Matches a single character, including a space
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