Regex not working with sed

Question

i have this text in file

"0000000441244"
"0000000127769"

I want to replace all zeros with 'L'

I am trying this and nothing gets chnaged

sed -e 's/0+/L/g' regex.txt

sed -e 's/(0+)/L/g' regex.txt

I want to know where i am wrong

Answer 1

Try this

sed -e 's/0\+/L/g' regex.txt