Using BusyBox shell, sed can't parse regex

Installing and Using OpenWrt
49

The problem seems to be related to the shell, not sed.

If you install and run bash, instead of BusyBox shell, it works, even when using BusyBox sed.

root@OpenWrt:~# echo $sample | LC_ALL=UTF-8 sed -e "s/[$(printf $emoji)]//g"
sed: bad regex '[\U1f300-\U1f5ff\U1f900-\U1f9ff\U1f600-\U1f64f\U1f680-\U1f6ff\U2600-\U26ff\U2700-\U27bf\U1f1e6-\U1f1ff\U1f191-\U1f251\U1f004\U1f0cf\U1f170-\U1f171\U1f17e-\U1f17f\U1f18e\U3030\U2b50\U2b55\U2934-\U2935\U2b05-\U2b07\U2b1b-\U2b1c\U3297\U3299\U303d\U00a9\U00ae\U2122\U23f3\U24c2\U23e9-\U23ef\U25b6\U23f8-\U23fa]': Invalid character range
root@OpenWrt:~# bash
root@OpenWrt:~# emoji="\U1f300-\U1f5ff\U1f900-\U1f9ff\U1f600-\U1f64f\U1f680-\U1f6ff\U2600-\U26ff\U2700-\U27bf\U1f1e6-\U1f1ff\U1f191-\U1f251\U1f004\U1f0cf\U1f170-\U1f171\U1f17e-\U1f17f\U1f18e\U3030\U2b50\U2b55\U2934-\U2935\U2b05-\U2b07\U2b1b-\U2b1c\U3297\U3299\U303d\U00a9\U00ae\U2122\U23f3\U24c2\U23e9-\U23ef\U25b6\U23f8-\U23fa"
sample="This 🍒 is ⭐ a 🐢 line 🤮 of 😃 emoji ✈"
echo $sample
This 🍒 is ⭐ a 🐢 line 🤮 of 😃 emoji ✈
root@OpenWrt:~# echo $sample | LC_ALL=UTF-8 sed -e "s/[$(printf $emoji)]//g"
This  is  a  line  of  emoji
root@OpenWrt:~# which sed
/bin/sed
root@OpenWrt:~# ls -l /bin/sed
lrwxr-xr-x    1 root     root            12 Jun 11 09:17 /bin/sed -> /bin/busybox
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