Hierarchy上の選択したGameObjectの名前を一括で変更する

RegexWindow.cs

#if UNITY_EDITOR

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.Linq;
using System.Text.RegularExpressions;

namespace Seiro.Utils
{

	public class RegexWindow : EditorWindow
	{

		[SerializeField]
		string _pattern = "";

		[SerializeField]
		string _replacement = "";

		[SerializeField]
		bool _serialNumber = false;

		void DoRename()
		{
			// 選択している中からGameObjectでMainなもの(PrefabのRootなど)だけとりだし
			var targets = Selection.gameObjects.Where(t => !AssetDatabase.IsMainAsset(t)).ToArray();

			Undo.RecordObjects(targets, "Regex Rename");

			// 連番を振る場合、SelectionがHierarchy上の見かけの順番と異なる場合があるので、ソートした方がよい。
			if (_serialNumber)
			{
				SortWithSibling(targets);
			}

			for (int i = 0, n = targets.Length; i < n; ++i)
			{
				var t = targets[i];
				var rep = "";
				if (_serialNumber)
				{
					rep = string.Format(_replacement, i);
				}
				else
				{
					rep = _replacement;
				}

				t.name = Regex.Replace(t.name, _pattern, rep);
			}
		}

		void SortWithSibling(GameObject[] src)
		{
			System.Array.Sort(src, (a, b) => a.transform.GetSiblingIndex() - b.transform.GetSiblingIndex());
		}

		void OnGUI()
		{
			_pattern = EditorGUILayout.TextField("Pattern", _pattern);
			_replacement = EditorGUILayout.TextField("Replacement", _replacement);
			_serialNumber = EditorGUILayout.Toggle("Serial Number", _serialNumber);

			EditorGUI.BeginDisabledGroup(Selection.gameObjects.Length == 0);

			if (GUILayout.Button("Do Rename"))
			{
				DoRename();
			}

			EditorGUI.EndDisabledGroup();			
		}

		[MenuItem("Window/Seiro/Regex")]
		public static void Open()
		{
			GetWindow<RegexWindow>();
		}
	}
}

#endif