function trim(str, chars) {    return ltrim(rtrim(str, chars), chars);}function ltrim(str, chars) {    chars = chars || "\\s";    return str.replace(new RegExp("^[" + chars + "]+", "g"), "");}function rtrim(str, chars) {    chars = chars || "\\s";    return str.replace(new RegExp("[" + chars + "]+$", "g"), "");}