Regular Expressions 101

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Regular Expression
.NET 7.0 (C#)

@"
(?mnxs-i) ^ (?!$) (?<Thousands> M{0,3} ) (?<Hundreds> ( (C(M|D)) (?!C) | D )? C{0,3} ) (?<Tens> ( (X(C|L)) (?!X) | L )? X{0,3} ) (?<Ones> ( (I(X|V)) (?!I) | V )? I{0,3} ) $
"
gmnxs
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Description

This regex matches every allowed roman numeral allowed under the traditional system. This system ended at 3999, as this was the biggest expressable number without additional symbols or notation.

Submitted by Ben - a month ago (Last modified a month ago)