diff --git a/web/app/components/base/prompt-editor/plugins/workflow-variable-block/workflow-variable-block-replacement-block.tsx b/web/app/components/base/prompt-editor/plugins/workflow-variable-block/workflow-variable-block-replacement-block.tsx
index c88b1661ad..0a80ecc220 100644
--- a/web/app/components/base/prompt-editor/plugins/workflow-variable-block/workflow-variable-block-replacement-block.tsx
+++ b/web/app/components/base/prompt-editor/plugins/workflow-variable-block/workflow-variable-block-replacement-block.tsx
@@ -12,7 +12,7 @@ import type { WorkflowVariableBlockType } from '../../types'
 import { CustomTextNode } from '../custom-text/node'
 import { $createWorkflowVariableBlockNode } from './node'
 import { WorkflowVariableBlockNode } from './index'
-import { VAR_REGEX as REGEX } from '@/config'
+import { VAR_REGEX as REGEX, resetReg } from '@/config'
 
 const WorkflowVariableBlockReplacementBlock = ({
   workflowNodesMap,
@@ -48,11 +48,12 @@ const WorkflowVariableBlockReplacementBlock = ({
   }, [])
 
   const transformListener = useCallback((textNode: any) => {
+    resetReg()
     return decoratorTransform(textNode, getMatch, createWorkflowVariableBlockNode)
   }, [createWorkflowVariableBlockNode, getMatch])
 
   useEffect(() => {
-    REGEX.lastIndex = 0
+    resetReg()
     return mergeRegister(
       editor.registerNodeTransform(CustomTextNode, transformListener),
     )
diff --git a/web/config/index.ts b/web/config/index.ts
index 21fc2f211c..9eb4889441 100644
--- a/web/config/index.ts
+++ b/web/config/index.ts
@@ -158,28 +158,28 @@ export const DEFAULT_AGENT_SETTING = {
 }
 
 export const DEFAULT_AGENT_PROMPT = {
-  chat: `Respond to the human as helpfully and accurately as possible. 
+  chat: `Respond to the human as helpfully and accurately as possible.
 
   {{instruction}}
-  
+
   You have access to the following tools:
-  
+
   {{tools}}
-  
+
   Use a json blob to specify a tool by providing an {{TOOL_NAME_KEY}} key (tool name) and an {{ACTION_INPUT_KEY}} key (tool input).
   Valid "{{TOOL_NAME_KEY}}" values: "Final Answer" or {{tool_names}}
-  
+
   Provide only ONE action per $JSON_BLOB, as shown:
-  
+
   \`\`\`
   {
     "{{TOOL_NAME_KEY}}": $TOOL_NAME,
     "{{ACTION_INPUT_KEY}}": $ACTION_INPUT
   }
   \`\`\`
-  
+
   Follow this format:
-  
+
   Question: input question to answer
   Thought: consider previous and subsequent steps
   Action:
@@ -196,10 +196,10 @@ export const DEFAULT_AGENT_PROMPT = {
     "{{ACTION_INPUT_KEY}}": "Final response to human"
   }
   \`\`\`
-  
+
   Begin! Reminder to ALWAYS respond with a valid json blob of a single action. Use tools if necessary. Respond directly if appropriate. Format is Action:\`\`\`$JSON_BLOB\`\`\`then Observation:.`,
   completion: `
-  Respond to the human as helpfully and accurately as possible. 
+  Respond to the human as helpfully and accurately as possible.
 
 {{instruction}}
 
@@ -246,6 +246,8 @@ Thought: {{agent_scratchpad}}
 
 export const VAR_REGEX = /\{\{(#[a-zA-Z0-9_-]{1,50}(\.[a-zA-Z_][a-zA-Z0-9_]{0,29}){1,10}#)\}\}/gi
 
+export const resetReg = () => VAR_REGEX.lastIndex = 0
+
 export let textGenerationTimeoutMs = 60000
 
 if (process.env.NEXT_PUBLIC_TEXT_GENERATION_TIMEOUT_MS && process.env.NEXT_PUBLIC_TEXT_GENERATION_TIMEOUT_MS !== '')