The pattern for correctly written roman numerals is
^M*(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$
That's "correctly" according to the usually accepted modern conventions for
roman numbering. But see for example
http://en.wikipedia.org/wiki/Roman_numerals#IIII_vs_IV
which includes a photograph of an inscription on Admiralty Arch in London
recording the date as MDCCCCX (=1910).
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
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