有意与无意之间

手机号脱敏

String phone = "18888888888";
String result1 = phone.replaceAll("(\d{3})\d{4}(\d{4})", "$1****$2");
System.out.println("脱敏后的手机号：" + result1);

邮箱脱敏

String email = "mail@sniu.com";
String result = email.replaceAll("(^\w)[^@]*(@.*$)", "$1****$2");
System.out.println("脱敏后的邮箱：" + result);

身份证号脱敏

String idCard = "30010019990101123X";
String result = idCard.replaceAll("(?<=\w{3})\w(?=\w{4})", "*");
System.out.println("脱敏后的身份证号：" + result);

银行卡号脱敏

String bankCard = "1234561234567895678";
String result = bankCard.replaceAll("(\d{6})\d{9}(\d{4})", "$1****$2");
System.out.println("脱敏的银行卡号：" + result);