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# Validating Roman Numerals Hacker Rank Solution – Queslers

## Problem : Validating Roman Numerals Hacker Rank 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
``````

### Validating Roman Numerals Hacker Rank Solution in python 2

``````import sys
import re
pattern = '^M{0,3}(D?C{0,3}|C(D|M))(L?X{0,3}|X(L|C))(V?I{0,3}|I(V|X))\$'

match = re.search(pattern, string)
if match and string != '':
print 'True'
else:
print 'False'``````

### Validating Roman Numerals Hacker Rank Solution in python 3

``````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 Hacker Rank Solution in pypy

``````# Enter your code here. Read input from STDIN. Print output to STDOUT
import re
pattern = '^(?=[MDCLXVI])M{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})\$'
roman = str(raw_input())
if re.search(pattern, roman):
print 'True'
else:
print 'False'``````

### Validating Roman Numerals Hacker Rank Solution in pypy 3

``````# Enter your code here. Read input from STDIN. Print output to STDOUT
import re

ptrn = r'^M{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})\$'
s = input().strip()

x = re.match(ptrn,s)
if x:
print(True)
else:
print(False)
``````
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