Expects the seed to contain /biome\d{2}/ where the 2 digits are a biome ID (left padded with 0 if necessary).
/biome\d{2}/
0
The biome to use or null if no valid match.
null
Expects the seed to contain
/biome\d{2}/where the 2 digits are a biome ID (left padded with0if necessary).