[Solved] String parsing, replace new line character

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Strings are immutable in Java – operations like replace don’t actually update the original string. You have to use the return value of the substring call, e.g.

String updated = str.substring(j,str.indexOf('>',j+1)).replaceAll("\n", "#10");

If you want to replace this in the overall string, you can simply concatenate this back into the string:

int indexOf = str.indexOf('>',j+1);
str = str.substring(0, j)
    + str.substring(j,indexOf).replaceAll("\n", "#10"))
    + str.substring(indexOf);

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solved String parsing, replace new line character