How to delete lines containing words in bash?

Question

linux

Good day!
Please tell me how to delete a line containing a specific name, it is with a dot, through this script, it runs without errors, but the line is not deleted, and if executed directly from the console with the command sed -i 'domain.ru/d' /etc/pool/conf .py, then the line is deleted, it is necessary to delete the lines through the bash script

#!/bin/bash
echo "Enter domain":
read domain
sed -i '$domain/d' /etc/pool/conf.py

Answer 1

$ cat test.sh 
#!/bin/bash
echo "Enter domain":
read domain
sed -i "/$domain/d" test.txt

Result:

cat test.txt 
aaa.com
bbb.com
ccc.com

 ./test.sh 
Enter domain:
bbb.com

cat test.txt 
aaa.com
ccc.com

Answer 2

$ a="test";echo "$a";echo '$a'
test
$a

A small test showing what the error is.