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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L.E. Modissett jr. easily makes it to 'CL'

in the Recluse series.