From c92f3ab032b7c54e728d2db043886c72359ee34f Mon Sep 17 00:00:00 2001
From: Yang Shi <yangshia@amazon.com>
Date: Wed, 29 Jul 2020 12:22:12 -0700
Subject: [PATCH] use regex that is supported by all browsers (#18811)

---
 docs/static_site/src/assets/js/copycode.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/static_site/src/assets/js/copycode.js b/docs/static_site/src/assets/js/copycode.js
index 75c6483369e0..6bda2f293973 100644
--- a/docs/static_site/src/assets/js/copycode.js
+++ b/docs/static_site/src/assets/js/copycode.js
@@ -59,7 +59,7 @@ $(document).ready(function () {
   const cleanPrompt = function (line, prompts) {
     let res = line;
     for (let i = 0; i < prompts.length; i++) {
-      let reg = new RegExp("(?<=^\\s*)" + prompts[i]);
+      let reg = new RegExp("(?:^\\s*)" + prompts[i]);
       if (reg.test(res)) {
         res = res.replace(reg, "");
         break;