CMD / Batch / Registry - String replace not working as expected?

Question

I\'m having the most fun trying to replace a substring in one line of code for a windows registry key

[HKEY_CLASSES_ROOT\\PING\\shell\\open\\command]
@=\"C:\         


        

Answer 1

Got it.. %v is actually

%v – For verbs that are none implies all. If there is no parameter passed this is the working directory.

got that from this answer

Working code

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\PING]
@="url:ping protocol"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\PING\shell]

[HKEY_CLASSES_ROOT\PING\shell\open]

[HKEY_CLASSES_ROOT\PING\shell\open\command]
@="cmd /k set myvar=%1 & call set myvar=%%myvar:ping:=%% & call set myvar=%%myvar:/=%% & call ping.exe %%myvar%% -t"

Answer 2

String replace is only possible with variables not with parameters like %1.

Something like this could be a starting point

set "var=%1" & call var=%%var:ping://=%%

In the registry it could look like

...
[HKEY_CLASSES_ROOT\PING\shell\open\command]
@="cmd /k ( set \"var=%1\" & call set var=%%var:ping://=%% & call set var=%%var:/=%% & call ping.exe %%var%% -t)"