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node_modules/core-js/internals/regexp-get-flags.js

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+'use strict';
+var call = require('../internals/function-call');
+var hasOwn = require('../internals/has-own-property');
+var isPrototypeOf = require('../internals/object-is-prototype-of');
+var regExpFlags = require('../internals/regexp-flags');
+
+var RegExpPrototype = RegExp.prototype;
+
+module.exports = function (R) {
+  var flags = R.flags;
+  return flags === undefined && !('flags' in RegExpPrototype) && !hasOwn(R, 'flags') && isPrototypeOf(RegExpPrototype, R)
+    ? call(regExpFlags, R) : flags;
+};