diff --git a/main.go b/main.go
index ef07279..e4af22f 100644
--- a/main.go
+++ b/main.go
@@ -469,6 +469,8 @@ func thompson(re []postfixNode) *State {
 							state.assert = NLB
 						}
 					}
+					tmpRe := shuntingYard(state.lookaroundRegex)
+					state.lookaroundNFA = thompson(tmpRe)
 
 				}
 			}