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node_modules/core-js/internals/regexp-unsupported-ncg.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>b)', 'g') -> /(?<a>b)/g and it causes SyntaxError
+var $RegExp = global.RegExp;
+
+module.exports = fails(function () {
+  var re = $RegExp('(?<a>b)', 'g');
+  return re.exec('b').groups.a !== 'b' ||
+    'b'.replace(re, '$<a>c') !== 'bc';
+});