常用正则表达式

1.判断是否是千分符字符

const numberIsThousand = str => /^-?\d{1,3}(,\d{3})*(\.\d+)?$/.test(str);
console.log(numberIsThousand('100,000,000,000.5')); // true
console.log(numberIsThousand('100,000,000,00')); // false

2.正则判断字符重复次数不超过两次

const strIsRepeatThan2 = (str = '') => /^(?!.*(.).*\1{2})[\da-zA-Z].+$/.test(str);
console.log(strIsRepeatThan2('2')); // TODO 单个字符有问题！
console.log(strIsRepeatThan2('21')); //  true
console.log(strIsRepeatThan2('22')); // true
console.log(strIsRepeatThan2('222')); // false

3. 正则匹配可以只有 0 但开头不能是 0 的数字

const getCorrectNumber = (str = '') => /^(\d|[1-9]\d*)$/.test(str);
console.log(getCorrectNumber('0')); // true
console.log(getCorrectNumber('011')); // false
console.log(getCorrectNumber('101')); // true

金额的格式化

console.log('$ 12345678'.replace(/\B(?=(\d{3})+(?!\d))/g, ',')); // $ 12,345,678.12
console.log('$ 12,345,678'.replace(/\$\s?|(,*)/g, '')); // 12345678
console.log('$ 12345678.5678'.replace(/\B(?=(\d{3})+(?!\d)(?<!([.]\d+)))/g, ','));
/**
 * 格式化金额 将以分为单位转化为以元为单位，2位小数 1,123,121.00
 * @param {string | number} money - 120000
 * @return {string} 120,000.00
 */
export const formateMoney = money =>
  (Number(money) / 100).toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ',');

字符串去重

'aaazzbbbbssssgssdddddd'.replace(/(\w)\1*/g, '$1'); // "azbsd"

双大括号替换值

var str = "My name is {{name}}, I'm {{age}} years old",
  reg = /{{(\w*?)}}/g;
var str1 = str.replace(reg, function (node, key) {
  return {
    name: '小明',
    age: 18
  }[key];
});
console.log(str1);

身份证

var reg = /^[1-9]\d{5}(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;

密码—至少 6 位，包含大写小写数字特殊字符

var reg = /^.*(?=.{6,})(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[~!@#$%^&*]).*$/;

邮箱

var reg = /^([A-z0-9_-]+\@([A-z0-9_\-\.]+\.(A-z){2,4}))/;

电话号码

var str = '+86-010-1234567-123', // 086-...
  reg = /^(([0/+]\d{2,3}-)?(0\d{2,3})-)(\d{7,8})(-(\d{3,}))?$/g;
var str1 = str.match(reg);
console.log(str1);

手机号码

var reg = /^(?:\(\+86\))?(?:13[0-9]|14[57]|15[012356789]|17[0678]|18[0-9])\d{8}$/g;

生日

var reg = /^(19|20)\d{2}([-/.])(0[1-9]|1[0-2])\2(0[1-9]|[12][0-9]|3[012])/;

模板替换的常用讨论

<div class="artical"></div>
<script type="text/html" id="tpl">
  <div class="wrap">
    <h1>{{title}}</h1>
    <h3>{{author}}</h3>
    <p>{{content}}</p>
  </div>
</script>
<script type="text/javascript">
  var tpl = document.getElementById('tpl').innerHTML,
    artical = document.getElementsByClassName('artical')[0];
  var reg = /{{(.*?)}}/g;
  artical.innerHTML = tpl.replace(reg, function (node, key) {
    return {
      title: '古悠悠行',
      author: '李贺',
      content: '白景归西山，碧华上迢迢。今古何处尽，千岁随风飘。海沙变成石，鱼沫吹秦桥。空光远流浪，铜柱从年消。'
    }[key];
  });
</script>