A regular expression to match valid Roman Numerals, which are written using the letters M, D, C, L, X, V, and I.
/^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$/
Matches:
- VI
- MCMXCIX
- VIII
Non-matches:
- vi
- MCCM
- iV
A regular expression to match valid Roman Numerals, which are written using the letters M, D, C, L, X, V, and I.
/^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$/