Regex to extract a particular string and assign it to a variable

Question

I have following string :

Jul 20 16:47:43 chefawsdeveastbck2 dhclient[1036]: bound to 10.205.5.122 -- renewal in 1797 seconds.
Jul 17 18:07:15 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) Sending gratuitous ARPs on eth0 for 10.205.5.121
Jul 17 18:07:10 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) Sending gratuitous ARPs on eth0 for 10.205.5.121
Jul 17 18:07:10 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) setting protocol VIPs.
Jul 17 18:07:10 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) Entering MASTER STATE
Jul 17 18:07:09 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) Transition to MASTER STATE
Jul 17 18:07:09 chefawsdeveastbck2 Keepalived_vrrp[937]: VRRP_Instance(PC_VI) Transition to Backup STATE

I only need to extract "MASTER STATE" , "backup STATE", "Backup STATE" from the above strings , which will always appear after "VRRP_Instance(PC_VI) Entering" or "VRRP_Instance(PC_VI) Transition to". Right now , i have wrote the following:

.*(VRRP_Instance.*.[EnteringTransitionto]+ )(?P<instance_state>.+)

It obviously is not right and picking up other strings as well. Please help.

Just to clarify, the block of text -- is each line a separate string, or is the entire block one string? — user3373470
– user3373470, Commented Jul 20, 2015 at 20:54
What language/tool are you using and what's your expected output? — anubhava
– anubhava, Commented Jul 20, 2015 at 21:09
I want to assign the value "MASTER STATE" and "Backup STATE" to a variable instance_state , for their respective lines . I am using Splunk tool. — Ishu Gupta
– Ishu Gupta, Commented Jul 20, 2015 at 21:11

Peter Brittain · Accepted Answer · 2015-07-20 21:35:05Z

1

You just need to use alternation to find your two possible key strings instead of trying to match any of the individual letters in them.

For example:

.*VRRP_Instance.*.(Entering|Transition to) (?P<instance_state>.+

answered Jul 20, 2015 at 21:35

Peter Brittain

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Vado · Accepted Answer · 2015-07-20 21:23:28Z

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If Master and Backup states are the only states you have then you can use regex like this ((?:\bMASTER\b|\bBACKUP\b) STATE)$ with Multiline (m), Ignore case (i) and Global (g) modifiers.

answered Jul 20, 2015 at 21:23

Vado

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Billy Moon · Accepted Answer · 2015-07-20 21:32:27Z

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/VRRP_Instance\(PC_VI\) (?:Entering|Transition to) ((?:MASTER|[bB]ackup) STATE)/

regexper diagram

answered Jul 20, 2015 at 21:32

Billy Moon

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