Algorithm

Problem Name: Python - Validating Roman Numerals

Problem Link: https://www.hackerrank.com/challenges/validate-a-roman-number/problem?isFullScreen=true

In this HackerRank Functions in PYTHON problem solution,

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.

 

Constraints

The number will be between 1 and 3999 (both included).

Sample Input

CDXXI

Sample Output

True

References

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.

https://developers.google.com/edu/python/regular-expressions

 

 

 

Code Examples

#1 Code Example with Python Programming

Code - Python Programming


regex_pattern = r"^((?P[IVXCDM])(?!(?P=a){3})|(?PL)(?!(?P=l)))+$"	


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

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