From 406fd1ed84a2d5ba4d7c6ff93079c1f30a266503 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E5=90=8D=E9=94=90?= <1565842059@qq.com>
Date: Fri, 28 Aug 2026 19:39:13 +0800
Subject: [PATCH] perf(util): replace global RWMutex with lock-free sync.Map in
 reCache to eliminate contention (fix #1690)

---
 util/builtin_operators.go | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/util/builtin_operators.go b/util/builtin_operators.go
index cb0361ef..6f26211f 100644
--- a/util/builtin_operators.go
+++ b/util/builtin_operators.go
@@ -40,8 +40,7 @@ var (
 	keyMatch5Re = regexp.MustCompile(`\{[^/]+\}`)
 	keyGet2Re1  = regexp.MustCompile(`:[^/]+`)
 	keyGet3Re1  = regexp.MustCompile(`\{[^/]+?\}`) // non-greedy match of `{...}` to support multiple {} in `/.../`
-	reCache     = map[string]*regexp.Regexp{}
-	reCacheMu   = sync.RWMutex{}
+	reCache     sync.Map                            // string -> *regexp.Regexp
 )
 
 // regexpMetaChars is exactly the set of characters that regexp.QuoteMeta escapes.
@@ -128,18 +127,13 @@ var (
 )
 
 func mustCompileOrGet(key string) *regexp.Regexp {
-	reCacheMu.RLock()
-	re, ok := reCache[key]
-	reCacheMu.RUnlock()
-
-	if !ok {
-		re = regexp.MustCompile(key)
-		reCacheMu.Lock()
-		reCache[key] = re
-		reCacheMu.Unlock()
+	if v, ok := reCache.Load(key); ok {
+		return v.(*regexp.Regexp)
 	}
 
-	return re
+	re := regexp.MustCompile(key)
+	actual, _ := reCache.LoadOrStore(key, re)
+	return actual.(*regexp.Regexp)
 }
 
 // validate the variadic parameter size and type as string.