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function strrchr (haystack, needle) {
    // Finds the last occurrence of a character in a string within another  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/strrchr    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   input by: Jason Wong (http://carrot.org/)
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: strrchr("Line 1\nLine 2\nLine 3", 10).substr(1)
    // *     returns 1: 'Line 3'    var pos = 0;
 
    if (typeof needle !== 'string') {
        needle = String.fromCharCode(parseInt(needle, 10));
    }    needle = needle.charAt(0);
    pos = haystack.lastIndexOf(needle);
    if (pos === -1) {
        return false;
    } 
    return haystack.substr(pos);
}

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strrchr("Line 1\nLine 2\nLine 3", 10).substr(1)

1

'Line 3'