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Be sure to keep the 'minimal matching' box checked whenever you use regexes (unless you're sure you don't want it). Sigil's support for non-greedy matching is very admirable and makes all the difference.
If you're experimenting with more complex regexes it's always a good idea to address the problem in stages, and save the book under a new name after each replace operation so you can backtrack if something goes wrong.
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