So siehts ganz gut aus !

node_modules/core-js/modules/_is-regexp.js

@@ -0,0 +1,8 @@
+// 7.2.8 IsRegExp(argument)
+var isObject = require('./_is-object');
+var cof = require('./_cof');
+var MATCH = require('./_wks')('match');
+module.exports = function (it) {
+  var isRegExp;
+  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : cof(it) == 'RegExp');
+};