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node_modules/core-js/internals/regexp-sticky-helpers.js

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+'use strict';
+var fails = require('../internals/fails');
+var global = require('../internals/global');
+
+// babel-minify and Closure Compiler transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
+var $RegExp = global.RegExp;
+
+var UNSUPPORTED_Y = fails(function () {
+  var re = $RegExp('a', 'y');
+  re.lastIndex = 2;
+  return re.exec('abcd') != null;
+});
+
+// UC Browser bug
+// https://github.com/zloirock/core-js/issues/1008
+var MISSED_STICKY = UNSUPPORTED_Y || fails(function () {
+  return !$RegExp('a', 'y').sticky;
+});
+
+var BROKEN_CARET = UNSUPPORTED_Y || fails(function () {
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=773687
+  var re = $RegExp('^r', 'gy');
+  re.lastIndex = 2;
+  return re.exec('str') != null;
+});
+
+module.exports = {
+  BROKEN_CARET: BROKEN_CARET,
+  MISSED_STICKY: MISSED_STICKY,
+  UNSUPPORTED_Y: UNSUPPORTED_Y
+};