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node_modules/core-js/internals/is-regexp.js

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+'use strict';
+var isObject = require('../internals/is-object');
+var classof = require('../internals/classof-raw');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+
+var MATCH = wellKnownSymbol('match');
+
+// `IsRegExp` abstract operation
+// https://tc39.es/ecma262/#sec-isregexp
+module.exports = function (it) {
+  var isRegExp;
+  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) == 'RegExp');
+};