input: Write a function to match a given string against a pattern that only allows numerical strings. If the string matches the pattern, the function should return True else return False. If the input string is empty, the function should return False.
  import re
  assert match_numeric_string('123456789')==True
  assert match_numeric_string('123a456789')==False
  assert match_numeric_string('0')==True
  assert match_numeric_string('')==False
  assert match_numeric_string('0123456789')==True
output: def match_numeric_string(s):
      if not s:
          return False
      return bool(re.match(r'^\d+$', s))