China DOS Union

I remember seeing a piece of software like this somewhere before, but I forgot its name (I'll use REPLACE for it for now). Its function is roughly like this:
For example, I have a variable TEST=How are you
Now I want to change "How" to "Good evening" but keep the value of TEST unchanged.
Is there such a command?
I remember there was such a command, but I've forgotten it.
It seemed to be like this:
replace %test%,"How","Good evening"
I don't remember the details clearly either,
If anyone has seen a command like this, please tell me. Thanks!

Replace seems to be the NT system command for replacing files, right? You should use the Strings command (it's on Wengier's MSDOS 7.1 boot disk):strings xyz=right %test%,4set test=Good evening%xyz%In the first command, the right parameter of Strings is used to put the rightmost four characters of %test% into the variable xyz. Since one Chinese character is made up of two characters, to extract “好吗” you need to extract 4 characters. Then use the SET command to combine “Good evening” and %xyz% (that is, “好吗”).