code: def labelValidator():
      return QRegExpValidator(QRegExp(r"^[^ \t].+"), None)
  
imports: import hashlib
  import os
  import re
  import sys
  from math import sqrt
  import cv2
  import numpy
  from PyQt5.QtCore import QRegExp, QT_VERSION_STR
  from PyQt5.QtGui import QIcon, QRegExpValidator, QColor
  from PyQt5.QtWidgets import QPushButton, QAction, QMenu
  from libs.ustr import ustr
label_desc: Use image node_id 5 for calling a global function with example usage: labelValidator() and returns: QRegExpValidator