Validating Roman Numerals in Python - HackerRank Solution
Problem :
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
Solution :
1 2 3 4 5 6 7 8 9 10 11 12 13 | # Validating Roman Numerals in Python - Hacker Rank Solution # Python 3 # Validating Roman Numerals in Python - Hacker Rank Solution START thousand = 'M{0,3}' hundred = '(C[MD]|D?C{0,3})' ten = '(X[CL]|L?X{0,3})' digit = '(I[VX]|V?I{0,3})' regex_pattern = r"%s%s%s%s$" % (thousand, hundred, ten, digit) # Do not delete 'r'. # Validating Roman Numerals in Python - Hacker Rank Solution END import re print(str(bool(re.match(regex_pattern, input())))) |
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Hey, I am Parthe Omkar
thousand = 'M{0,3}'
hundred = '(C[MD]|D?C{0,3})'
ten = '(X[CL]|L?X{0,3})'
digit = '(I[VX]|V?I{0,3})'
regex_pattern = r"M{0,3}(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[VX]|V?I{0,3})$" # Do not delete 'r'.
import re
print(str(bool(re.match(regex_pattern, input()))))