how to remove japanese characters?

[garfieldpb2024]

i have some youtube videos, tthat have i think japanese characters in the file name.
How to remove them and every other "not normal" character ? Only the numbers and a-z should stay

some one told me this:
[^\x20-\x7F]+/g

but it works only on half the characters. And i dont understand how it works,so i cant change this to the right value

[Admin]

Using Regex(1) in Bulk Rename Utility:

Match: [^\x20-\x7F]+/g
Replace: <leave empty>

Should remove them. What characters are not removed?