ButtonNameToText.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEditor;
using TMPro;
using System.Text.RegularExpressions;

public class ButtonNameToText : EditorWindow
{
    /// When right-clicking on a Button GameObject in Scene, you can use the Button Name To Text option
    /// to set the Text components text field to the name of the button GameObject.
    [MenuItem("GameObject/Button Name To Text", false, 0)]
    public static void Convert()
    {
        GameObject[] objsToChange = Selection.gameObjects;
        List<GameObject> buttons = new List<GameObject>();
        foreach(GameObject obj in objsToChange)
        {
            if(obj.GetComponent<Button>() != null)
                buttons.Add(obj);
        }
        string tmp;
        foreach(GameObject obj in buttons)
        {
            tmp = Regex.Replace(obj.name, "([a-z])([A-Z])", "$1 $2");
            if(obj.GetComponentInChildren<Text>() != null)
            {
                Undo.RecordObject(obj.GetComponentInChildren<Text>(), "Changed Text");
                obj.GetComponentInChildren<Text>().text = tmp;
                EditorUtility.SetDirty(obj.GetComponentInChildren<Text>());
            }
            else if(obj.GetComponentInChildren<TMP_Text>() != null)
            {
                Undo.RecordObject(obj.GetComponentInChildren<TMP_Text>(), "Changed Text");
                obj.GetComponentInChildren<TMP_Text>().text = tmp;
                EditorUtility.SetDirty(obj.GetComponentInChildren<TMP_Text>());
            }
        }
    }
}