code: def validate_label_eng(label):
      # For now we can only handle [a-z ']
      if re.search(r"[0-9]|[(<\[\]&*{]", label) is not None:
          return None
  
      label = label.replace("-", " ")
      label = label.replace("_", " ")
      label = re.sub("[ ]{2,}", " ", label)
      label = label.replace(".", "")
      label = label.replace(",", "")
      label = label.replace(";", "")
      label = label.replace("?", "")
      label = label.replace("!", "")
      label = label.replace(":", "")
      label = label.replace('"', "")
      label = label.strip()
      label = label.lower()
  
      return label if label else None
  
file_path: DeepSpeech/training/deepspeech_training/util/importers.py
imports: import argparse
  import importlib
  import os
  import re
  import sys
  from .helpers import secs_to_hours
  from collections import Counter
label_desc: Use image node_id 6 for calling a global function with example usage: validate_label_eng(label) and returns: unknown, None