diff --git a/web/app/components/app/configuration/tools/external-data-tool-modal.tsx b/web/app/components/app/configuration/tools/external-data-tool-modal.tsx
index 3fd020f60f..61ca562ccd 100644
--- a/web/app/components/app/configuration/tools/external-data-tool-modal.tsx
+++ b/web/app/components/app/configuration/tools/external-data-tool-modal.tsx
@@ -153,7 +153,7 @@ const ExternalDataToolModal: FC<ExternalDataToolModalProps> = ({
       return
     }
 
-    if (localeData.variable && !/[a-zA-Z_]\w{0,29}/g.test(localeData.variable)) {
+    if (localeData.variable && !/^[a-zA-Z_]\w{0,29}$/.test(localeData.variable)) {
       notify({ type: 'error', message: t('appDebug.varKeyError.notValid', { key: t('appDebug.feature.tools.modal.variableName.title') }) })
       return
     }
diff --git a/web/app/components/rag-pipeline/components/input-field/editor/form/schema.ts b/web/app/components/rag-pipeline/components/input-field/editor/form/schema.ts
index 4dfa85a559..13c707ea31 100644
--- a/web/app/components/rag-pipeline/components/input-field/editor/form/schema.ts
+++ b/web/app/components/rag-pipeline/components/input-field/editor/form/schema.ts
@@ -25,14 +25,14 @@ export const createInputFieldSchema = (type: PipelineInputVarType, t: TFunction,
   const { maxFileUploadLimit } = options
   const commonSchema = z.object({
     type: InputTypeEnum,
-    variable: z.string({
-      invalid_type_error: t('appDebug.varKeyError.notValid', { key: t('appDebug.variableConfig.varName') }),
-    }).nonempty({
+    variable: z.string().nonempty({
       message: t('appDebug.varKeyError.canNoBeEmpty', { key: t('appDebug.variableConfig.varName') }),
     }).max(MAX_VAR_KEY_LENGTH, {
       message: t('appDebug.varKeyError.tooLong', { key: t('appDebug.variableConfig.varName') }),
     }).regex(/^(?!\d)\w+/, {
       message: t('appDebug.varKeyError.notStartWithNumber', { key: t('appDebug.variableConfig.varName') }),
+    }).regex(/^[a-zA-Z_]\w{0,29}$/, {
+      message: t('appDebug.varKeyError.notValid', { key: t('appDebug.variableConfig.varName') }),
     }),
     label: z.string().nonempty({
       message: t('appDebug.variableConfig.errorMsg.labelNameRequired'),