From a1ff61a8ba5619eeec480fbda2ff1d7b4540062e Mon Sep 17 00:00:00 2001
From: Emilia <100027345+sovietspaceship@users.noreply.github.com>
Date: Tue, 6 Oct 2026 09:45:52 +0100
Subject: [PATCH] fix(core): Build the user regex engine lazily on reset

resetUserRegexEngine rebuilt the default engine eagerly, while every
other reset path in this module builds lazily on next use. Shutdown
paid for a second, immediately-unused engine instance every time.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
---
 packages/workflow/src/safe-regex.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/workflow/src/safe-regex.ts b/packages/workflow/src/safe-regex.ts
index a94cd729757..dbe5562647a 100644
--- a/packages/workflow/src/safe-regex.ts
+++ b/packages/workflow/src/safe-regex.ts
@@ -212,7 +212,7 @@ export function setUserRegexEngine(regexEngine: RegexEngine): void {
 }
 
 export function resetUserRegexEngine(): void {
-	userEngine = createDefaultEngine();
+	userEngine = undefined;
 }
 
 function getUserEngine(): RegexEngine {