input: 
  from typing import List
  
  def match_numeric_strings(strings: List[str]) -> bool:
      """ Check if all strings in the given list are numeric strings using a regular expression.
      >>> match_numeric_strings(['123456789', '987654321'])
      True
      >>> match_numeric_strings(['123456789', 'abc123'])
      False
      """
  
output:     import re
      pattern = re.compile(r'^\d+$')
      for s in strings:
          if not pattern.match(s):
              return False
      return True