Replace a specific letter in list

Hello
I need to know how can I manage a list of strings to replace the letter “O” by the number 0 in each item.
thank you for your help

@ASSILI_KARIM

String.Replace

SearchFor should be “O.0” and replaceWith should be “0.0”.
Otherwise you would replace all O’s with zeroes.
Also, I think what you are really looking for is “O.” and “0.” as that will also replace all O’s in front of any number, not just zeroes.