I try this but isn't working The blocks are in the same file called inputs.conf. Trying to change all of the indexes ending in _pr (or _np) to window_pr (or window_np). WinEventLog blocks in inputs.conf is limited to Application, Security, System, ForwardedEvents, and Setup. Monitor blocks in inputs.conf is limited to messages, secure, cron, maillog, spooler, audit, audit.log The third code changes every indexes in each block. Have other files in inputs.conf i do not want to change the indexes. The fourth code print result work like a magic for windows. but getting error when using -i to modify completely. eg. perl -00pe -i Have included the code and the monitor blocks in inputs.conf for linux but that could`t change the indexes to linux_pr (or linux_np). 
perl -00lpe '$"_.*index.*=.*np$/index = window_np" if m,//(Application
+|Security|System|ForwardedEvents|Setup)\],;' inputs.conf

perl -00lpe '$"_.*index.*=.*pr$/index = window_pr" if m,//(Application
+|Security|System|ForwardedEvents|Setup)\],;' inputs.conf

perl -pe 's/^index\s*=\s*\K.+(?=_(?:np|pr)\s*$)/window/' inputs.conf

perl -00pe 's#^\[WinEventLog://(?:Application|Security|System|Forwarde
+dEvents|Setup)\]\n.*^index\s*=\s*\K.+(?=_(?:np|pr)\s*$)#window#ms' in
+puts.conf

perl -00pe 's#^\[monitor:///(?:messages|secure|cron|maillog|spooler|au
+dit/audit\.log)\]\n.*^index\S*=\s*\K.+(?=_(?:np|pr)\s*$)#linux#ms' in
+puts.conf

perl -0p -i.bak -e 's#(\[monitor:///var/log/(?:messages|secure|cron|ma
+illog|spooler|audit/audit\.log)\](?:(?:\R.*){1})index=).*#$1linux#g' 
+inputs.conf


local $/="\n\n";

while (<DATA>){
   if ( my ($prefix,$suffix)=m/\[WinEventLog:.+index = (\w+)_(pr|np)\s
+*$/s){
       # print "$prefix\_$suffix found .. replacing...\n";
       s/index = $prefix\_$suffix\s*$/index = window_$suffix\n\n/;
   }
   print ;
}

__DATA__
[WinEventLog://Application]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = CNDO_pr

[WinEventLog://Security]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = CGWS_pr

[WinEventLog://System]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = DMRW_pr

[WinEventLog://ForwardedEvents]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = NENP_pr

[WinEventLog://Setup]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = EOFK_pr

[WinEventLog://Application]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = FDWD_np

[WinEventLog://Security]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = ASKD_np

[WinEventLog://System]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = JMSF_np

[WinEventLog://ForwardedEvents]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = JCCD_np

[WinEventLog://Setup]
checkpointInterval = 5
current_only = 0
disabled =0
start_from = oldest
index = HSMS_np
[monitor:///var/log/messages]
index=BDBD_np
sourcetype=syslog

_DATA_
[monitor:///var/log/cron]
index=NDNW_np
sourcetype=syslog

[monitor:///var/log/maillog]
index=BSKX_np
sourcetype=syslog

[monitor:///var/log/secure]
index=NDNDK_np
sourcetype=syslog

[monitor:///var/log/spooler]
index=DNWN_np
sourcetype=syslog

[monitor:///var/log/audit/audit.log]
index=XBJB_np
sourcetype=syslog

[monitor:///var/log/messages]
index=JNJSJ_pr
sourcetype=syslog

[monitor:///var/log/cron]
index=NCJG_pr
sourcetype=syslog

[monitor:///var/log/maillog]
index=JE3K_pr
sourcetype=syslog

[monitor:///var/log/secure]
index=NLNDKN_pr
sourcetype=syslog

[monitor:///var/log/spooler]
index=EKJC_pr
sourcetype=syslog

[monitor:///var/log/audit/audit.log]
index=QKNK_pr
sourcetype=syslog

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2019-07-07 Athanasius added code tags

In reply to Regex for replacing capture group content using perl by Zagidi

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