c# 手機號分割

一、把手機號中間4爲隱藏

public  string ReturnPhoneNO(string phoneNo) { Regex re = new Regex("(\\d{3})(\\d{4})(\\d{4})", RegexOptions.None); phoneNo = re.Replace(phoneNo, "$1****$3"); return phoneNo; } //例: ReturnPhoneNO(131000084840); 輸出：131****84840

二、手機號間隔顯示

public  string ReturnPhoneNO(string phoneNo) { Regex re = new Regex("(\\d{3})(\\d{4})(\\d{4})", RegexOptions.None); phoneNo = re.Replace(phoneNo, "$1 $2 $3"); return phoneNo; } //例: ReturnPhoneNO(131000084840); 輸出：131 0000 84840