--- /dev/null
+/*!
+ * is-extglob <https://github.com/jonschlinkert/is-extglob>
+ *
+ * Copyright (c) 2014-2016, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+module.exports = function isExtglob(str) {
+ if (typeof str !== 'string' || str === '') {
+ return false;
+ }
+
+ var match;
+ while ((match = /(\\).|([@?!+*]\(.*\))/g.exec(str))) {
+ if (match[2]) return true;
+ str = str.slice(match.index + match[0].length);
+ }
+
+ return false;
+};