Quote:
Originally Posted by Manichean
Hm. Roman numerals contain combinations of "I", "V", "X" and maybe "L" (I don't think you'd have to go higher with books). So, the expression should do the job.
Edit to add: There's a tutorial for regular expressions and XPath in the Calibre manual that might help.
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D'oh, I didn't think of just matching the letters used. I was thinking there might be some sort of "Roman Numeral Conversion", probably because Calibre converts to Roman Numerals for the series if you choose that option.