non-case-sensitive sed - OpenWrt

Question

the input would be like this in a file:

<sCripT

and the parsing looks like this:

sed -i "s/<script//g" SOMETHING.html

the "/gi" is not good, because OpenWrt doesn't knows it (busybox..):

sed: bad option in substitution expression

Does anybody know how could i delete e.g.: the:

< sCripT or 
"<scRiPt" 

with one sed?

Plus (the really thing i need): how could i delete the whole line containing

"<sCripT" or 
"<scRiPt", etc.?

Answer 1

I can't see a way using Busybox's sed, but you could use Busybox's sh and grep like this:

while IFS='
' read -r line; do
    printf "%s\n" "$line" | grep -qi '<script' || printf "%s\n" "$line"
done <SOMETHING.html >SOMETHING.html.tmp
mv SOMETHING.html.tmp SOMETHING.html

Answer 2

Does the Busybox not have grep -v?

This should do the job in one simple command:

grep -vi "<[ \t]*script" SOMETHING.html