How do i use regex in shell script for replacing capture group content

Question

Inputs files in multiple directories and want to change the exiting index name to index = windows_pr and index = windows_np.

The WinEventLog blocks shown are all in the same file called inputs.conf but reside in different folder name as A. (EVZ_pr_windows/inputs.conf) and B, (DEG_np_windows/inputs.conf). So any file stanza, with indexes ending _pr will be in folder A inputs.conf whilst, any file stanza with indexes ending _np will be in folder B inputs.conf. The script should change indexes ending _pr to index = windows_pr and indexes ending _np to index = windows_np

WinEventLog blocks in inputs.conf is limited to Application, Security, System, ForwardedEvents, and Setup

I try this but getting error

Below is the error

\]_,/s/.*index.*=.*pr$/index = window_pr/' inputs.conf

sed: -e expression #1, char 69: unterminated address regex

#!/bin/bash

sed -E -i '\_\[WinEventLog://(Application|Security|System|ForwardedEvents|Setup)
\]_,/s/.*index.*=.*np$/index = window_np/' inputs.conf

sed -E -i '\_\[WinEventLog://(Application|Security|System|ForwardedEvents|Setup)
\]_,/s/.*index.*=.*pr$/index = window_pr/' inputs.conf


[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

Answer 1

Considering the error message and assuming that expression #1 begins with \\_, char 69 of that expression appears to be _ immediately following ]. Consequently, I'd guess that you need a \ preceeding that _ to provide a proper terminator for the expression.