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Manichean's correct - DOTALL needs a dot. That said, \s+ will traverse newlines, so as long as that's in the right place the proposed regexes should be ok.
All that said, I can't tell what you're really trying to do - where are you placing this regex that it's doing something useful for you? PDF has some hard-coded regexes to do basically what you're asking for. One built-in pdf regex - one that has more false positives - only becomes enabled when preprocessing is enabled. I could have sworn that a single number followed by an optional dot (and optionally followed by a title on a second line) was already covered by the default regex....
You could open a bug with your file if you like and we can take a look at it from there.
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