次のUnicode文字列から日本語文字を取り除きます
string = "\u65e5\u672c\u8a9e\u3067\u306f\u3053\u3093\u306b\u3061\u306f"
# Remove Japanese characters
new_string = re.sub(r"[\u3040-\u309f\u30a0-\u30ff\uff00-\uff9f]", "", string) 

print(new_string) # Output: "ねんごへん"