From e4e8393a357143f0d102704f37d965d696763fdb Mon Sep 17 00:00:00 2001
From: KaKa <climba03003@gmail.com>
Date: Fri, 6 Jan 2023 18:05:40 +0800
Subject: [PATCH] (v3.x) perf: only check for isEssence once in RegExp for 
 content-type-parser (#4481) (#4497)

---
 lib/contentTypeParser.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/contentTypeParser.js b/lib/contentTypeParser.js
index dc8f4de389..eb321e06f4 100644
--- a/lib/contentTypeParser.js
+++ b/lib/contentTypeParser.js
@@ -72,6 +72,7 @@ ContentTypeParser.prototype.add = function (contentType, opts, parserFn) {
     if (contentTypeIsString) {
       this.parserList.unshift(new ParserListItem(contentType))
     } else {
+      contentType.isEssence = contentType.source.indexOf(';') === -1
       this.parserRegExpList.unshift(contentType)
     }
     this.customParsers.set(contentType.toString(), parser)
@@ -396,7 +397,7 @@ function compareContentType (contentType, parserListItem) {
 }
 
 function compareRegExpContentType (contentType, essenceMIMEType, regexp) {
-  if (regexp.source.indexOf(';') === -1) {
+  if (regexp.isEssence) {
     // we do essence check
     return regexp.test(essenceMIMEType)
   } else {