Js regular replaces part of the hidden ID card or mobile phone number and part of the hidden name

1. Hide the middle 4 digits of the mobile phone number

var phone = "18200002111";
phone.replace(/^(\d{3})\d+(\d{4})$/."$1 * * * * $2");
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2, id card hide the middle number

var idcard = '530026222211032101';
 
idcard.replace(/^(\d{6})\d+(\d{4})$/."$1 * * * * * * $2");

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3. Display only the last digit of the name

var name = 'Joe';
 name.replace(/. (? =) /g.The '*');

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4. Display the first word of the name

let name ="Fifty"
let newname = name.replace(/ (? < =.) ./g.The '*');
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