js regexp group & RegExp.`$1`~`$9` All In One

js regexp group & RegExp.$1~ RegExp.$9 All In One

信息加密，电话号码隐藏

const phoneNumber = `18123456789`;

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, '$1****$2');
// '181****2345' ❌

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, '$1****$3');
// '181****6789' ✅

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, '$1$2****');
// '1812345****' ❌

regexp 可视化

https://regexper.com/#%2F^(\d{3})(\d{4})(\d{4})%24%2F

RegExp group

const phoneNumber = `18123456789`;

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, function(match, group1, group2, group3) {
  console.log("match, group1, group2, group3 =", match, group1, group2, group3);
});
// match, group1, group2, group3 = 18123456789 181 2345 6789

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, (match, group1, group2, group3) => {
  console.log("match, group1, group2, group3 =", match, group1, group2, group3);
});
// match, group1, group2, group3 = 18123456789 181 2345 6789

phoneNumber.replace(/^(\d{3})(\d{4})(\d{4})$/, (match, ...groups) => {
  console.log("match, groups =", match, groups);
});
// match, groups = 18123456789 (5) ['181', '2345', '6789', 0, '18123456789']

RegExp.$1~RegExp.$9

const reg = /(\w+)\s(\w+)/;
const name = 'Eric Xia';
name.replace(reg, '$2 $1'); 
// "Xia Eric"
RegExp.$1;
// "Eric"
RegExp.$2;
// "Xia"

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/n

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