diff --git a/src/miniflask/state.py b/src/miniflask/state.py
index 8020287..379958a 100644
--- a/src/miniflask/state.py
+++ b/src/miniflask/state.py
@@ -383,7 +383,7 @@ def __str__(self):
 
 class state_node:
 
-    _lambda_str_regex = re.compile(r"^{?\s*\"\w*\"\s*:\s*lambda\s*\w*:.*}?")
+    _lambda_str_regex = re.compile(r"^{?\s*(\"[^\"]*\")|('[^']*')\s*:\s*lambda\s*\w*:.*}?")
     local_arguments = []
     depends_on = []
     depends_alternatives = []