input: 
  from typing import List
  
  def match_numeric_strings(strings: List[str]) -> bool:
      """Check if all strings in the given list are valid numeric strings.
      A valid numeric string is defined as a string composed entirely of digits.
      
      >>> match_numeric_strings(['123', '456', '789'])
      True
      >>> match_numeric_strings(['123', 'abc', '789'])
      False
      """
      import re
      pattern = '^[0-9]+$'
      for string in strings:
          if not re.match(pattern, string):
              return False
      return True
  
output:     import re
      pattern = '^[0-9]+$'
      for string in strings:
          if not re.match(pattern, string):
              return False
      return True