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use double quotes
tag=$(sed -n "/${line}/ s/.*\[\(.*\)].*/\1/p" myfile.txt)

var=$(sed -n '/0001/ s/.*\[\(.*\)].*/\1/p' file)



MD5="MD5 value"

sed '/0001/ s/\[.*]/['"$MD5]"'/' file

# echo "0001 zz 43242 [replace this text] name" | sed '/^0001/s/\[.*\]/anything/'
0001 zz 43242 anything name


# cat input
0001 zz 43242 [replace this text] name
0002 sd 65466 [UK] country...

Placing 'hello' in a text file would almost certainly add a newline.

Maybe your echo doesn't support -n and is printing "-n hello". Solaris shell utilities are frequently dumb like that. Try...