正則表達式

匹配最後兩位替換為00 let str= "123456" ; str.replace(/\d{2}$/, '00'); // 123400 str.replace(/(\d{4})(\d{2})/, '$100'); // 123400 2.手機號中間4為替換為 * let str ="17700001234" str.replace(/(\d{3})\d{4}