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kovidgoyal · 10-04-2015, 12:22 PM

IIRC the regex engine cannot do reverse searches with back references, since at the time of the back reference, the group has not yet matched.

You either need to replace \1 with [hH][1-6] or use direction down.

10-04-2015, 12:22 PM	#4
kovidgoyal creator of calibre Posts: 45,821 Karma: 28586150 Join Date: Oct 2006 Location: Mumbai, India Device: Various	IIRC the regex engine cannot do reverse searches with back references, since at the time of the back reference, the group has not yet matched. You either need to replace \1 with [hH][1-6] or use direction down.