HackerRank Python Solution - Regex and Parsing - Validating Roman Numerals

  • You are given a string, and you have to validate whether it's a valid Roman numeral. If it is valid, print True. Otherwise, print False. Try to create a regular expression for a valid Roman numeral.
Input Format:
  • A single line of input containing a string of Roman characters.
Output Format:
  • Output a single line containing True or False according to the instructions above.
  • The number will be between 1 and 3999 (both included).
Sample Input:

Sample Output:

  • Regular expressions are a key concept in any programming language. A quick explanation with Python examples is available here. You could also go through the link below to read more about regular expressions in Python.

regex_pattern = r"^(?=[MDCLXVI])M{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$"

import re
print(str(bool(re.match(regex_pattern, input()))))
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