indexOf Case Sensitive?

Question

Is the indexOf(String) method case sensitive? If so, is there a case insensitive version of it?

Answer 1

The first question has already been answered many times. Yes, the String.indexOf() methods are all case-sensitive.

If you need a locale-sensitive indexOf() you could use the Collator. Depending on the strength value you set you can get case insensitive comparison, and also treat accented letters as the same as the non-accented ones, etc. Here is an example of how to do this:

private int indexOf(String original, String search) {
    Collator collator = Collator.getInstance();
    collator.setStrength(Collator.PRIMARY);
    for (int i = 0; i <= original.length() - search.length(); i++) {
        if (collator.equals(search, original.substring(i, i + search.length()))) {
            return i;
        }
    }
    return -1;
}