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[Jonathan Corwin <j@xxxxxxxxxxxx>]

The r'' just prevents python string processing from handling \'s. It doesn't affect the regex. You still need to escape the special regex characters. 

However I think your original string might have worked, since python appears to leave in \'s that don't precede a special python shortcut, but's it best to play safe.

Since / isn't a special regex character, I think you instead need:
r'[\\/:\*\?"<>\|\+\[\]%]'

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https://code.launchpad.net/~phill-ridout/openlp/bug952533/+merge/98928
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