Question

I have the following method, where I want the regex given to the split method to find all instances of the comma character (“,”), if if is not preceded by letter “x”.

The method:

public void replaceTest3() {
        String valueRaw = "onex,two,three,fourx,five";
        String[] splittedString = valueRaw.split("[(.,)]&&[^x{1}+,]");
        for (int i = 0; i < splittedString.length; i++) {
            System.out.println(splittedString[i]);
        }
}

So I would expect this method to output

onex,two
three
fourx,five

However, as the regex currently is, the latter part to exclude all instances of commas preceded by "x" doesn't work - apparently nothing is found. Where is my error and how could I achieve what I want to do?

Answer 1

find all instances of the comma character (“,”), if if is not
preceeded by letter “x”.

Could be done with a negative lookbehind like this:

(?<!x),

I.e:

valueRaw.split("(?<!x),");