function lastIndexOf( str, searchValue ) {
	var len;
	var N;
	var i;

	len = str.length;
	N = searchValue.length;
	for ( i = len-N; i >= 0; i-- ) {
		if ( str.substring( i, i+N ) === searchValue ) {
			return i;
		}
	}
	return -1;
}
Returns the last index of a specified string.

## Notes

-   The function assumes that `searchValue.length < str.length`.

@private
@param {string} str - string to search
@param {string} searchValue - string to match
@returns {integer} index