fork(1) download 
  1. import re
  2. import sys
  3.  
  4. def is_proper_roman_numeral(s):
  5.      return re.fullmatch('(?xi)'
  6.          '(?=[MDCLXVI])'
  7.          '(?P<thousands> M{,3})'
  8.          '(?P<hundreds>D?C{,3}|CM|CD)'
  9.          '(?P<tens>    L?X{,3}|XC|XL)'
  10.          '(?P<units>   V?I{,3}|IX|IV)', s)
  11.  
  12. for line in sys.stdin:
  13.     line = line.strip()
  14.     NOT = " NOT" * (not is_proper_roman_numeral(line))
  15.     print("{line!r} is{NOT} valid".format(**vars()))
Success #stdin #stdout 0.01s 28008KB
comments (?)
stdin 
XII
XI

IX
IIX
stdout 
'XII' is valid
'XI' is valid
'' is NOT valid
'IX' is valid
'IIX' is NOT valid
https://ideone.com/c9xfNS
language:
Python 3 (python  3.12)
created:
8 years ago
visibility:
secret

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