They just need regular potting soil?
Gadzooks no. Regular potting soil will kill them....too many chemicals.
These guys do best in pete moss (Not Miracle grow - that has fertilizer) and perlite (again, not miracle grow) or LFS (long fibered sphagnum).
Also, when watering, use rain water, distilled water or reverse osmosis filtered water. Tap water will do in a pinch, but don't make a habbit of it. Again, due to the mineral content (and sometime chlorine).
Since these are bog plants (the one pictured, anyway), that means like to be wet. They can handle drying out if it's only for a very short period (a day), but they prefer to be nice and soggy - I use either undrained pots, or pots in deep saucers.
Sarracenia (the pitcher plant there) like as much sun as you can give them (I think they would live ON the sun, if they could).
The sundew (D. capensis) isn't quite so sun-thirsty, and does best in morning sun/evening sun for the summer (protected from the REALLY strong mid-day sun). In Summer, the mid day sun won't kill it (usually), but they look ratty.
They do thrive on high light, though, so the rest of the year you can keep them fully exposed.
Neither one of these required a terrarium - they do just fine with humidity as low as 30% (sundew) and 5% (pitcher plant) - they just need to be watered more frequently.
This may seem like a lot - but once you have them set up, they pretty much thrive on neglect (just don't forget the water).