正則表達式 金額驗證

 let reg = /(^[1-9](\d+)?(\.\d{1,2})?$)|(^[1-9]$)|(^\d\.[1-9]{1,2}$)|(^\d\.[0]{1}[1-9]{1}$|(^\d\.[1-9]{1}[0]{1}$)$)/;
 let num = 0.01;
 if (reg.exec(num)) {
     console.log('驗證通過');
 } else {
     console.log('驗證失敗');
 }