fork download
copy 
  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
copy 
XII
XI

IX
IIX
stdout
copy 
'XII' is valid
'XI' is valid
'' is NOT valid
'IX' is valid
'IIX' is NOT valid
https://ideone.com/c9xfNS
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!