Surprisingly similar questions had been asked multiple times but none of the solutions worked for my use case - which is to replace a string which can contains all possible special characters.
In a text file, i.e
hello.txt
ABC="12'{}34[];|^)(*&^!^#~`!-567"
And a shell script
run.sh
#!/bin/sh
key="12'{}34[];|^)(*&^!^#~`!-567"
escappedKey=$(printf '%s\n' "$key" | sed -e 's/[]\/$*.^[]/\\&/g');
value="345$`{}[]|%';"
escappedValue=$(printf '%s\n' "$value" | sed -e 's/[]\/$*.^[]/\\&/g');
sed -i "s/$escappedKey/$escappedValue/g" hello.txt
Expected result in
hello.txt
ABC="345$`{}[]|%';"
But the above sed cmd in run.sh doesn't work. And I have also tried with:
sed -e 's/[][\\^*+.$-]/\\\1/g'
from: Replacing special characters in a shell script using sed
sed -e 's/[\/&]/\\&/g'
from: Escape a string for a sed replace pattern
but both doesn't work.