Search object in Prefabs, Material, Scene, by GUID

FindGUIDinObject

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using System;
using System.IO;


public class findGuid : MonoBehaviour {

    [MenuItem("Assets/Find GUID in Prefabs Material Scene")]
    private static void FindGUIDinPrefabs1()
    {
        var selected = Selection.activeObject;
        string patch = AssetDatabase.GetAssetPath(selected);
        string guids = AssetDatabase.AssetPathToGUID(patch);
        Debug.Log("" + patch + " guid: " + guids + "");
        findObj(guids, "t: Material");
        findObj(guids, "t: Prefab");
        findObj(guids, "t: Scene");
    }

    [MenuItem("Assets/Find GUID in Prefabs")]
    private static void FindGUIDinPrefabs2()
    {
        var selected = Selection.activeObject;
        string patch = AssetDatabase.GetAssetPath(selected);
        string guids = AssetDatabase.AssetPathToGUID(patch);
        Debug.Log("" + patch + " guid: " + guids + "");
        findObj(guids, "t: Prefab");
    }

    [MenuItem("Assets/Find GUID in Material")]
    private static void FindGUIDinPrefabs3()
    {
        var selected = Selection.activeObject;
        string patch = AssetDatabase.GetAssetPath(selected);
        string guids = AssetDatabase.AssetPathToGUID(patch);
        Debug.Log("" + patch + " guid: " + guids + "");
        findObj(guids, "t: Material");
    }

    [MenuItem("Assets/Find GUID in Scene")]
    private static void FindGUIDinPrefabs4()
    {
        var selected = Selection.activeObject;
        string patch = AssetDatabase.GetAssetPath(selected);
        string guids = AssetDatabase.AssetPathToGUID(patch);
        Debug.Log("<size=12><color=#0000ffff>" + patch + " guid: " + guids + "</color></size>");
        findObj(guids, "t: Scene");
    }

    static List<string> ret = new List<string>();
    public static List<string> findObj(string guids, string findAssetsText)
    {
        ret = new List<string>();
        string[] guids2 = AssetDatabase.FindAssets(findAssetsText);
        foreach (string guid in guids2)
        {
            string assetPath = AssetDatabase.GUIDToAssetPath(guid);
            try
            {   
                using (StreamReader sr = new StreamReader(Application.dataPath + "/../" + assetPath))
                {                              
                    string line = sr.ReadToEnd();
                    if (line.Contains(guids))
                    {
                        Debug.Log("<size=14><color=#0000ffff> Found file::" + assetPath + "</color></size>");
                        ret.Add(assetPath);
                    }
                }
            }
            catch (Exception e)
            {
                Debug.Log(e.Message);
            }
        }
        if (ret.Count < 1)
        {
            Debug.Log("<size=14><color=#ff0f0fff> NOT Found files</color></size>");
        }
        return ret;
    }
}