正则的应用（?=.* 和 ?=. 区别）

校验邮箱

const isEmail = (str) => {
  const reg = /^[a-z0-9]+([._\\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$/g
  return reg.test(str)
}

校验用户名

const isValidUsername = (str) => {
  const reg = /^[0-9a-zA-z|_]{1,20}$/g
  return reg.test(str)
}

数字格式化 1,123,000

"1234567890".replace(/\B(?=(?:\d{3})+(?!\d))/g,",") // 结果：1,234,567,890，匹配的是后面是3*n个数字的非单词边界(\B)

校验密码

const isValidPassword = (str) => {
  // 强密码：字母+数字+特殊字符
  const strong = /^(?=.*\d)(?=.*[a-zA-Z])(?=.*[!_~.@#$%^&*?])[a-zA-Z!_~.@#$%^&*?0-9]{3,18}$/g
  // 中：字母+数字、字母+特殊字符、特殊字符+数字
  const reg = /^(?![a-zA-Z]+$)(?![!_~.@#$%^&*?]?$)(?![0-9]+$)[a-zA-Z!_~.@#$%^&*?0-9]{3,18}$/g
  // 弱：纯数字、纯字母、纯特殊字符
  const ruo = /^(?:\d+|[a-zA-Z]+|[!_~.@#$%^&*?]+)$/g
  return [strong.test(str), reg.test(str), ruo.test(str)]
}
console.log(isValidPassword("2?3432"))

/*~~~~~~~~~~~~~ ?=.* 和 ?=. 区别 ~~~~~~~~~~~~~~~~*/
const reg = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{3,10}$/
console.log(reg.test("aQ123"), reg.test("12aQ3")) // true, true
// 必须字母开头
const exp = /^(?=.[a-zA-Z])(?=.*\d).{3,10}$/
console.log(exp.test("aQ123"), exp.test("12aQ3")) // true, false

校验身份证

var checkProv = function (val) { // 省级地址码校验
  var pattern = /^[1-9][0-9]/;
  var provs = {11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门"};
  if(pattern.test(val)) {
    if(provs[val]) {
      return true;
    }
  }
  return false;
}
var checkDate = function (val) { // 出生日期校验
  var pattern = /^(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
  if(pattern.test(val)) {
    var year = val.substring(0, 4);
    var month = val.substring(4, 6);
    var date = val.substring(6, 8);
    var date2 = new Date(year+"-"+month+"-"+date);
    if(date2 && date2.getMonth() == (parseInt(month) - 1)) {
      return true;
    }
  }
  return false;
}

var checkCode = function (val) { // 校验码校验
  var p = /^[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]$/;
  var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
  var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
  var code = val.substring(17);
  if(p.test(val)) {
    var sum = 0;
    for(var i=0;i<17;i++) {
      sum += val[i]*factor[i];
    }
    if(parity[sum % 11] == code.toUpperCase()) {
      return true;
    }
  }
  return false;
}

var checkID = function (val) {
  if(checkCode(val)) {
    var date = val.substring(6,14);
    if(checkDate(date)) {
      if(checkProv(val.substring(0,2))) {
        return true;
      }
    }
  }
  return false;
}

正则的应用（?=.* 和 ?=. 区别）

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