diff --git a/src/misc/b3util.ts b/src/misc/b3util.ts
index fbdda0e..3f41bf5 100644
--- a/src/misc/b3util.ts
+++ b/src/misc/b3util.ts
@@ -141,7 +141,7 @@ export const isNewVersion = (version: string) => {
 };
 
 export const isValidVariableName = (name: string) => {
-  return /^[a-zA-Z_]/.test(name);
+  return /^[a-zA-Z_$]*$/.test(name);
 };
 
 export const isSubtreeRoot = (data: NodeData) => {