js驗證車牌號包含新能源車牌

//車牌號驗證方法
 function isVehicleNumber(vehicleNumber) {
 var xreg=/^[京津滬渝冀豫雲遼黑湘皖魯新蘇浙贛鄂桂甘晉蒙陝吉閩貴粵青藏川寧瓊使領A-Z]{1}[A-Z]{1}(([0-9]{5}[DF]$)|([DF][A-HJ-NP-Z0-9][0-9]{4}$))/;
 var creg=/^[京津滬渝冀豫雲遼黑湘皖魯新蘇浙贛鄂桂甘晉蒙陝吉閩貴粵青藏川寧瓊使領A-Z]{1}[A-Z]{1}[A-HJ-NP-Z0-9]{4}[A-HJ-NP-Z0-9掛學警港澳]{1}$/;
 if(vehicleNumber.length == 7){
 return creg.test(vehicleNumber);
 } else if(vehicleNumber.length == 8){
 return xreg.test(vehicleNumber);
 } else{
 return false;
 }
 }