find the nth occurence of a substring in a string in java?

Question

I have a string that is the complete content of an html page and I am trying to find the index of 2nd occurence of . Does anyone have any suggesti

Answer 1

Working further on https://stackoverflow.com/a/5678546/15789 and https://stackoverflow.com/a/14356988/15789 (Thanks to original posters @sebastiaan-van-den-broek and @assylias).

Get all the indices in an array. Then you can get any nth index. In many cases, it may be required to get the nth index of a substring within a string multiple number of times. Getting an array once and accessing it multiple times may be easier.

public static int[] getIndices(String source, String substr) {
    List indicesList = null;
    int index = source.indexOf(substr);
    if (index == -1) {
        return new int[0];
    } else {
        indicesList = new ArrayList<>();
        indicesList.add(index);
    }

    while (index != -1) {
        index = source.indexOf(substr, index + 1);
        if (index != -1) {
            indicesList.add(index);
        }
    }

    // Integer[] iarr = new int[1]; 
    //Autoboxing does not work with arrays. Run loop to convert. 
    //toArray does not convert Integer[] to int[]
    int[] indices = new int[indicesList.size()];
    for (int i = 0; i < indicesList.size(); i++) {
        indices[i] = indicesList.get(i);
    }
    return indices;
}