diff --git a/src/core/transform.ts b/src/core/transform.ts
index ad3ad31..046118e 100644
--- a/src/core/transform.ts
+++ b/src/core/transform.ts
@@ -6,7 +6,7 @@ import { transformScriptSetup } from './transformScriptSetup'
 import { transformSfcRefSugar } from './transformSfcRefSugar'
 import { resolveOptions } from './options'
 
-const scriptSetupRE = /<script\s(.*\s)?setup(\s.*)?>/
+const scriptSetupRE = /<script\s+(.*\s+)?setup(\s+.*)?(\s+)?>/
 
 export function shouldTransform(code: string, id: string, options?: ScriptSetupTransformOptions): boolean {
   // avoid transforming twice