Recurrent Complex Expressions & Logic

Recurrent Complex uses a powerful expression system to determine where and when structures should spawn. These are boolean strings used in the Structure GUI.

Common Expression Types

• Biome Expressions: biome:minecraft:plains, type:SANDY, !biome:minecraft:ocean (spawns in plains or sandy areas, but not oceans).
• Dimension Expressions: 0 (Overworld), -1 (Nether), 1 (End).
• Dependency Expressions: mod:ironchest (only spawns if the Iron Chests mod is installed).
• Logic Operators: Use & (And), | (Or), and ! (Not) to combine conditions.

Example: type:FOREST & !biome:minecraft:birch_forest targets all forest biomes except Birch Forests.