diff --git a/src/regex.ts b/src/regex.ts
index 7acc773..aa41bc5 100644
--- a/src/regex.ts
+++ b/src/regex.ts
@@ -1,5 +1,5 @@
 const multilineCommentsRE = /\/\*.*?\*\//gms
-const singlelineCommentsRE = /\/\/.*$/gm
+const singlelineCommentsRE = /(?:^|\n|\r)\s*\/\/.*(?:\r|\n|$)/gm
 const templateLiteralRE = /\$\{(\s*(?:(?!\$\{).|\n|\r)*?\s*)\}/g
 const quotesRE = [
   /(["'`])((?:\\\1|(?!\1)|.|\r)*?)\1/gm,
diff --git a/test/index.test.ts b/test/index.test.ts
index d0ae0a8..4f2772a 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -188,3 +188,21 @@ test('forgiving', () => {
   "
 `)
 })
+
+test('// in string', () => {
+  const str = [
+    'const url= `http://www.xx.com`;',
+    'const url1= \'http://www.xx.com\';',
+    'onMounted(() => console.log(123))',
+    'const str = `hello world`',
+    '// Notes',
+  ].join('\n')
+
+  expect(executeWithVerify(str)).toMatchInlineSnapshot(`
+    "const url= \`                 \`;
+    const url1= \'                 \';
+    onMounted(() => console.log(123))
+    const str = \`           \`
+            "
+  `)
+})