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  1. Prepare
  2. Python
  3. Regex and Parsing
  4. Validating Roman Numerals
  5. Discussions

Validating Roman Numerals

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199 Discussions

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  • sefamutlucu
     + 0 comments
    regex_pattern = r"(?!.*(I{4}|V{2,}|X{4}|L{2,}|C{4}|D{2,}|M{4})).*$"

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

  • rejin_gunasekar1
     + 0 comments
    regex_pattern = r"^(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()))))

  • kunalkawate424
     + 0 comments

    Regular Expression for this problem

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

  • n4m774r_d
     + 0 comments

    regex_pattern = r"^(?!.*(I{4}|V{2,}|X{4}|L{2,}|C{4}|D{2,}|M{4})).*$"

  • solders_array0m
     + 1 comment
    # Make the regex intent clearer and allow use of named groups for debug

import re
start = r"^"
thousands = r"(?P<thousands>M{0,3})"
hundreds = r"(?P<hundreds>CM|CD|(D{0,1}C{0,3}))"
tens = r"(?P<tens>XC|XL|(L{0,1}X{0,3}))"
units = r"(?P<units>IX|IV|(V{0,1}I{0,3}))"
end = r"$"
regex_pattern = rf"{start}{thousands}{hundreds}{tens}{units}{end}"	 # Do not delete 'r'.