problem with dollar sign replacement

problem with dollar sign replacement

Hi, I am trying to avoid users from entering the dollar sign in a string field So I want to check if the dollar sign is in the string and if so replace it with nothing if (input.invoer.indexOf("%") >= 0){ input.invoer = (input.invoer).replaceAll("%","");} This works other characters. If I do this for # or & it works. But only not for the dollar sign Please let me know how to solve this? Rob