diff --git a/src/dpdebugger.py b/src/dpdebugger.py
index 2a82a4b..15fec3e 100644
--- a/src/dpdebugger.py
+++ b/src/dpdebugger.py
@@ -139,7 +139,10 @@ class Debugger:
                     f"z: {flags.z}\n"
                     )
 
-        elif re.fullmatch(r'r\d+', to_print):
+        elif re.fullmatch(
+                # r0-r255
+                r'r(0|[1-9][0-9]|1[0-9][0-9]|2[1-4][1-9]|25[1-5])',
+                to_print):
             index = int(to_print[1:])
             return f"{to_print}: {self._vm.registers[index].value}"