diff -uNr qtscript-everywhere-src-5.15.3/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.cpp qtscript-everywhere-src-5.15.3.mod/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.cpp
--- qtscript-everywhere-src-5.15.3/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.cpp	2020-10-27 16:02:11.000000000 +0800
+++ qtscript-everywhere-src-5.15.3.mod/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.cpp	2022-09-18 10:16:45.485067410 +0800
@@ -1396,11 +1396,6 @@
     RegexGenerator generator(pattern);
     generator.compile(globalData, jitObject);
 
-    if (generator.generationFailed()) {
-        JSRegExpIgnoreCaseOption ignoreCaseOption = ignoreCase ? JSRegExpIgnoreCase : JSRegExpDoNotIgnoreCase;
-        JSRegExpMultilineOption multilineOption = multiline ? JSRegExpMultiline : JSRegExpSingleLine;
-        jitObject.setFallback(jsRegExpCompile(reinterpret_cast<const UChar*>(patternString.data()), patternString.size(), ignoreCaseOption, multilineOption, &numSubpatterns, &error));
-    }
 }
 
 }}
diff -uNr qtscript-everywhere-src-5.15.3/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.h qtscript-everywhere-src-5.15.3.mod/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.h
--- qtscript-everywhere-src-5.15.3/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.h	2020-10-27 16:02:11.000000000 +0800
+++ qtscript-everywhere-src-5.15.3.mod/src/3rdparty/javascriptcore/JavaScriptCore/yarr/RegexJIT.h	2022-09-18 10:17:42.355067388 +0800
@@ -59,12 +59,6 @@
     {
     }
 
-    ~RegexCodeBlock()
-    {
-        if (m_fallback)
-            jsRegExpFree(m_fallback);
-    }
-
     JSRegExp* getFallback() { return m_fallback; }
     void setFallback(JSRegExp* fallback) { m_fallback = fallback; }
 
@@ -85,9 +79,6 @@
 
 inline int executeRegex(RegexCodeBlock& jitObject, const UChar* input, unsigned start, unsigned length, int* output, int outputArraySize)
 {
-    if (JSRegExp* fallback = jitObject.getFallback())
-        return (jsRegExpExecute(fallback, input, length, start, output, outputArraySize) < 0) ? -1 : output[0];
-
     return jitObject.execute(input, start, length, output);
 }