Find gameobjects whose tag matches parent menu group

using UnityEngine;
using System.Collections.Generic;

public static class GameObjectTools
{
    // usage:  GameObjectTools.FindObjectsInTagGroup("ParentGroup");
    // will return all in ParentGroup/ChildGroup1 ParentGroup/ChildGroup2 etc...
    public static GameObject[] FindObjectsInTagGroup(string group)
    {
        string[] tags = UnityEditorInternal.InternalEditorUtility.tags;
        var objs = new List<GameObject>();
        for(int n=0; n<tags.Length; ++n)
        {
            if (tags[n].StartsWith(group+"/"))
            {
                objs.AddRange( GameObject.FindGameObjectsWithTag(tags[n]));
            }
        }
        return objs.ToArray();
    }
}