Placeholder in PrefabFilter ?

Hey folks,

for example there are

• fuel_tank_a_300
• fuel_tank_a_600
• fuel_tank_a_900
• fuel_tank_b_300
• fuel_tank_b_600
• fuel_tank_b_900

Because they are pretty much the same it would be nice to handle them with one lootable definition. Is there some way like fuel_tank_*_* ? Or much better using regular expression like fuel_tank_[a|b]_[0-9]? Or if that's too complicated, could the prefab filter be converted into a list? 

Thanks and greetings