input: Write a function to match a given string against a regular expression pattern for numeric strings. The function should return True if the string matches the numeric pattern, otherwise it should return False. If the string is empty, it should return False.
  
  assert match_numeric_string('123456789')==True
  assert match_numeric_string('abc123')==False
  assert match_numeric_string('9876.54')==False
  assert match_numeric_string('')==False
  assert match_numeric_string('0')==True
output: def match_numeric_string(s):
      if not s:
          return False
      return s.isdigit()