c# 手机号分割

一、把手机号中间4为隐藏

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); 输出：131****84840

二、手机号间隔显示

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); 输出：131 0000 84840