prevented possible RegExp#split problems in old engines, close #751, …

…close #919, thanks @Khartir

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Prevented possible `RegExp#split` problems in old engines, [#751](https://github.com/zloirock/core-js/issues/751), [#919](https://github.com/zloirock/core-js/issues/919)
 - Detection of Safari 10 string padding bug extended to some Safari-based browsers
 
 ##### 3.10.0 - 2021.03.31

packages/core-js/internals/fix-regexp-well-known-symbol-logic.js

@@ -4,7 +4,6 @@ require('../modules/es.regexp.exec');
 var redefine = require('../internals/redefine');
 var fails = require('../internals/fails');
 var wellKnownSymbol = require('../internals/well-known-symbol');
-var regexpExec = require('../internals/regexp-exec');
 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
 
 var SPECIES = wellKnownSymbol('species');
@@ -95,7 +94,7 @@ module.exports = function (KEY, length, exec, sham) {
   ) {
     var nativeRegExpMethod = /./[SYMBOL];
     var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
-      if (regexp.exec === regexpExec) {
+      if (regexp.exec === RegExp.prototype.exec) {
         if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
           // The native String method already delegates to @@method (this
           // polyfilled function), leasing to infinite recursion.

packages/core-js/internals/regexp-exec.js

@@ -4,9 +4,6 @@ var stickyHelpers = require('./regexp-sticky-helpers');
 var shared = require('./shared');
 
 var nativeExec = RegExp.prototype.exec;
-// This always refers to the native implementation, because the
-// String#replace polyfill uses ./fix-regexp-well-known-symbol-logic.js,
-// which loads this file before patching the method.
 var nativeReplace = shared('native-string-replace', String.prototype.replace);
 
 var patchedExec = nativeExec;