fix-py-syntax-warning

src/ifcopenshell-python/ifcopenshell/express/bootstrap.py

@@ -204,7 +204,7 @@ for id in to_emit:
     statements.append("%s << %s" % (id, stmt))
 
 if __name__ == "__main__":
-    print("""
+    print(r"""
 # This file is generated by IfcOpenShell ifcexpressparser bootstrap.py
 
 from __future__ import annotations

src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py

@@ -585,7 +585,7 @@ def process_local_variable(context):
         if (
             context.parameter_type.generalized_types.general_aggregation_types.general_set_type
         ):
-            expr = re.sub("(\[[^\]]*\])", "express_set(\\1)", expr)
+            expr = re.sub(r"(\[[^\]]*\])", "express_set(\\1)", expr)
 
         return "%s = %s" % (str(context.variable_id).lower(), expr)
     else:

src/ifcopenshell-python/ifcopenshell/file.py

@@ -409,7 +409,7 @@ class file:
     def schema(self) -> Literal["IFC2X3", "IFC4", "IFC4X3"]:
         """General IFC schema version: IFC2X3, IFC4, IFC4X3."""
         prefixes = ("IFC", "X", "_ADD", "_TC")
-        reg = "".join(f"(?P<{s}>{s}\d+)?" for s in prefixes)
+        reg = "".join(f"(?P<{s}>{s}\\d+)?" for s in prefixes)
         match = re.match(reg, self.wrapped_data.schema)
         version_tuple = tuple(
             map(