how to use sed delete Unicode in some range?

Question

I want to remove Unicode in some range, e.g.:

echo \"abcＡＢＣ123\" | sed \'s/[\\uff21-\\uff3b]//g\'

expect \"abc123\", but get:

Answer 1

Not sure why sed is not working, but you can use tr instead

$ echo 'abcＡＢＣ123' | tr -d 'Ａ-Ｚ'
abc123

From man tr

tr - translate or delete characters

-d, --delete delete characters in SET1, do not translate

Answer 2

Unicode support in sed is not well defined. You may be better off using command line perl:

echo "abcＡＢＣ123" | perl -CS -pe 's/[\x{FF21}-\x{FF3B}]+//g'

abc123

It is important to use -CS flags here to be able to get correct UTF8 encodings for input/output/error.