--- /dev/null
+var makeString = require('./helper/makeString');
+var defaultToWhiteSpace = require('./helper/defaultToWhiteSpace');
+var nativeTrim = String.prototype.trim;
+
+module.exports = function trim(str, characters) {
+ str = makeString(str);
+ if (!characters && nativeTrim) return nativeTrim.call(str);
+ characters = defaultToWhiteSpace(characters);
+ return str.replace(new RegExp('^' + characters + '+|' + characters + '+$', 'g'), '');
+};