Below are the all available options:

RegView accepts the following Command Line Parameters: 
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"regview /?"
show this help.

"regview Filenam1.reg Filename2.reg ..."
RegView will import Filenam1.reg Filename2.reg registry files 
and commit those registry key and value changes.

"regview /v reg_file"
view registry file first before committing registry changes.

"regview /s SearchString1 SearchString2 ..."
search any registry keys and values which contain "SearchString1", 
"SearchString2" and so on; this search result will be logged to "regview.log".

"regview /r SearchString ReplaceString"
any registry keys and values which contain "SearchString" will be 
replaced with "ReplaceString"; this search and replace result will be 
logged to "regview.log".

"regview /d SearchString1 SearchString2 ..."
any registry keys and values which contain "SearchString1", 
"SearchString2" and so on will be deleted; this search and delete 
result will be logged to "regview.log". Additionally, you can add "m" 
to "match the whole search string only", "u" to search 
"HKEY_USERS root only", "l" to search "HKEY_LOCAL_MACHINE root 
only" or "n" to the end of parameter string to specify not creating log file; 
for example, "regview /rmln Test Test123" will search only the registry keys 
and values which match the whole word "Test" and be replaced with 
"Test123" under the root HKEY_LOCAL_MACHINE and no log file created. 

"regview /pr profilename"
record registry profile named as "profilename". Additionally, you can add "u" 
to record "HKEY_USERS" root only", "l" to record "HKEY_LOCAL_MACHINE" 
root only". By default "/pr" will record both "HKEY_USERS" and
"HKEY_LOCAL_MACHINE". 

"regview /pi profilename"
record ini file profile named as "profilename".

"regview /pd profilename"
record Dirs and Files profile named as "profilename".

"regview /pdv profilename"
record Dirs and Files profile named as "profilename" with file version info.

"regview /pa profilename"
record all - registry, ini file, Dirs and Files profile named as "profilename".

"regview /pav profilename"
record all - registry, ini file, Dirs and Files(with file version info) profile named 
as "profilename".