Bit(Tornado|Comet|Lord|Spirit)
This regex filter is the same as the four seperate simple
string filters "BitTornado", "BitComet", "BitLord", and
"BitSpirit".
BitComet\s0\.[0-5][\d]
This will block all BitComet versions from 0.00 to 0.59.
Azureus\s([^2]|2\.[^3]|2\.3\.[^0]|2\.3\.0\.[^4])
All versions of Azureus except version 2.3.0.4 will be blocked
by this regex.
Azureus\s([^2]|2\.[^3]|2\.3\.[^0]|2\.3\.0\.[^4])|Bit(Tornado|Lord|Spirit|Comet\s0\.[0-5][\d])
This last example is just one way to combine the three example
filters above into one large regex filter.