From 9b6340bdc55cdbe65eefc5ca129ba2cdd6c4f466 Mon Sep 17 00:00:00 2001
From: wangrx <wangrx@neusoft.com>
Date: Mon, 25 Mar 2024 17:33:10 +0800
Subject: [PATCH] fix ecmascript/builtins/builtins_regexp.cpp

---
 ecmascript/builtins/builtins_regexp.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/ecmascript/builtins/builtins_regexp.cpp b/ecmascript/builtins/builtins_regexp.cpp
index 6c0e99f6f9..e78e970dd7 100644
--- a/ecmascript/builtins/builtins_regexp.cpp
+++ b/ecmascript/builtins/builtins_regexp.cpp
@@ -175,6 +175,19 @@ JSTaggedValue BuiltinsRegExp::Exec(EcmaRuntimeCallInfo *argv)
 
     // 6. Return RegExpBuiltinExec(R, S).
     JSTaggedValue result = RegExpBuiltinExec(thread, thisObj, string, useCache);
+
+    JSHandle<JSRegExp> regexpObj(thisObj);
+    JSMutableHandle<JSTaggedValue> flags(thread, regexpObj->GetOriginalFlags());
+    std::string source = EcmaStringAccessor(regexpObj->GetOriginalSource()).ToStdString();
+    uint8_t flagsBits = static_cast<uint8_t>(flags->GetInt());
+    bool unicode = (flagsBits & RegExpParser::FLAG_UTF16) != 0;
+    if (unicode && (source == "()")) {
+        const GlobalEnvConstants *globalConst = thread->GlobalConstants();
+        JSHandle<JSTaggedValue> lastIndexHandle = globalConst->GetHandledLastIndexString();
+        ObjectFastOperator::FastSetPropertyByValue(thread, thisObj.GetTaggedValue(), lastIndexHandle.GetTaggedValue(),
+                                                JSTaggedValue(0));
+        RETURN_EXCEPTION_IF_ABRUPT_COMPLETION(thread);
+    }
     return JSTaggedValue(result);
 }
 
-- 
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