Add rule for Roman Numbers

[kosloot]

It would be nice to have Roman Numbers detected.

The regexp may look like this:
^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$

see: Here

[kosloot]

A first test reveals some difficulties.
Ucto has explicit shortcuts for 1-letter words. So I, V X etc. are NOT detected.
Adding such a ROMAN-NUMBERS rule needs reprogramming and thinking. And will slow ucto down a bit.

[kosloot]

On the other hand... I V and X are ambiguous anyway. So labeling them as ROMAN-NUMBER is probably never a good idea? Or just add this rule, and accept that 1-letter numbers are labelled as WORD?