Mask phone number
phone.replaceAll("(\\d{3})\\d{4}(\\d{4})","$1****$2");
152****4799
idCard. replaceAll("(\\d{4})\\d{10}(\\w{4})","$1*****$2");
4304*****7733
$1, $2, … ...represents the matching content in the first, second, ... brackets in the regular expression
The password needs to enter characters + numbers (special symbols can be entered)
^(?![0-9]+$)(?![a-zA-Z]+$)\S{6,16}$
Add a unique constraint to the already built table
ALTER TABLE uc_user_policy ADD unique(user_id)