How to search gameobject in scene by tag name

You can combine the approach suggested by @fafase, and apply the selection to the objects found by that query.

Here's the full code for that (add this under an Editor folder):

 using UnityEngine;
 using System.Collections;
 using UnityEditor;
 
 public class SelectByTag : MonoBehaviour {
 
     private static string SelectedTag = "Player";
 
     [MenuItem("Helpers/Select By Tag")]
     public static void SelectObjectsWithTag()
     {
         GameObject[] objects = GameObject.FindGameObjectsWithTag(SelectedTag);
         Selection.objects = objects;
     }
 }

This will add a new menu item "`Helpers/Select By Tag`" to your toolbar. Clicking it will highlight should highlight all objects tagged with the given tag name (set by the static field "`SelectedTag`")

@liortal ... Does anyone have an update for this? That would perhaps give a select list of all the tags saved in the project?