From 21c2c01ebed902c70763bb9319c3ec48c4cb5284 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bartek=20Iwa=C5=84czuk?= <biwanczuk@gmail.com>
Date: Mon, 5 Jun 2023 10:52:40 +0200
Subject: perf: optimize RegExp usage in JS (#19364)

Towards https://github.com/denoland/deno/issues/19330

Shows about 1% improvement in the HTTP benchmark.
---
 ext/web/01_mimesniff.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'ext/web')

diff --git a/ext/web/01_mimesniff.js b/ext/web/01_mimesniff.js
index ad89f33cd..7d402e080 100644
--- a/ext/web/01_mimesniff.js
+++ b/ext/web/01_mimesniff.js
@@ -13,6 +13,7 @@ const {
   MapPrototypeHas,
   MapPrototypeSet,
   RegExpPrototypeTest,
+  RegExpPrototypeExec,
   SafeMap,
   SafeMapIterator,
   StringPrototypeReplaceAll,
@@ -197,7 +198,7 @@ function serializeMimeType(mimeType) {
   for (const param of new SafeMapIterator(mimeType.parameters)) {
     serialization += `;${param[0]}=`;
     let value = param[1];
-    if (!RegExpPrototypeTest(HTTP_TOKEN_CODE_POINT_RE, value)) {
+    if (RegExpPrototypeExec(HTTP_TOKEN_CODE_POINT_RE, value) === null) {
       value = StringPrototypeReplaceAll(value, "\\", "\\\\");
       value = StringPrototypeReplaceAll(value, '"', '\\"');
       value = `"${value}"`;
-- 
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