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Home Web Front-end JS Tutorial The 20 most commonly used regular expressions in JavaScript

The 20 most commonly used regular expressions in JavaScript

php中世界最好的语言
php中世界最好的语言
Feb 27, 2018 am 09:56 AM
javascript js expression

这次给大家带来JavaScript里最常用的20条正则表达式，JavaScript里最常用的正则表达式注意事项有哪些，下面就是实战案例，一起来看一下。

1.trim功能（清除字符串两端空格)

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String.prototype.trim = function() { return this.replace(/(^\s+)|(\s+$)/g, '');

};' abc '.trim();// 输出 "abc"

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2. 提取浏览器中url的参数名和参数值

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function getUrlParam(url) {

  var result = {},

      url = url || window.location.href,

      reg = /([\?|&])(.+?)=([^&?]*)/gi,

      arr = reg.exec(url);

   

  while(arr) {    result[arr[2]] = arr[3];

    arr = reg.exec(url);

  }

  

  return result;

} getUrlParam('https://www.baidu.com?a=0&b=1&c=2');// 输出 "{a: "0", b: "1", c: "2"}"

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3. 扩展typeof，探明具体类型

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function getType(obj) { var result = Object.prototype.toString.call(obj);     result = result.replace(/\[object\s(\w+)\]/, '$1');

   

  return result;

} getType([1,2]);// 输出 "Array"getType(null);// 输出 "Null"

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4. 在字符串的指定位置插入新字符

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String.prototype.insertAt = function(str, index) {

  index += 1;

  var reg = new RegExp('(^.{' + index + '})');

  

  return this.replace(reg, '$1' + str);

};  'abcde'.insertAt('123', 2);// 输出 "abc123de"

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5. 隐藏手机号中间4位

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function telFormat(tel) {

  tel = String(tel);

  return tel.replace(/(\d{3})(\d{4})(\d{4})/, '$1****$3');

}   telFormat(13899207998);// 输出 "138****7998"

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6. 字符串调换

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var name = "Doe Jone";

name.replace(/(\w+)\s* \s*(\w+)/, "$2 $1"); // 输出 "Jone Doe"

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7. 字符串截取

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var str = ' asfdf === sdfaf ##';

str.match(/[^===]+(?=[===])/g);

// 输出 " asfdf "

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8. 检测密码强度正则

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// 必须是包含大小写字母和数字的组合，不能使用特殊字符，长度在8-10之间。

/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$/.test("weeeeeeeW2");// 输出 true

// 密码强度正则，最少6位，包括至少1个大写字母，1个小写字母，1个数字，1个特殊字符

/^.*(?=.{6,})(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[!@#$%^&*? ]).*$/.test("diaoD123#");

// 输出 true

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9. 检测中文字符

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// 检测字符串是否只含中文

/^[\u4e00-\u9fa5]{0,}$/.test("但是d");// 输出 false

/^[\u4e00-\u9fa5]{0,}$/.test("但是");// 输出 true

// 包含有中文

/[\u4E00-\u9FA5]/.test("但是d");// 输出 true

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10. 身份证号正则

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/^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/.test("42112319870115371X");

// 输出 false

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11. 校验日期 （“yyyy-mm-dd“ 格式，已考虑平闰年）

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// 日期正则，简单判定,未做月份及日期的判定

var dP1 = /^\d{4}(\-)\d{1,2}\1\d{1,2}$/;

console.log(dP1.test("2017-05-11"));

// 输出 true

console.log(dP1.test("2017-15-11"));// 输出 true

// 日期正则，复杂判定

var dP2 = /^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$/;

console.log(dP2.test("2017-02-11"));// 输出 true

console.log(dP2.test("2017-15-11"));

// 输出 false

console.log(dP2.test("2017-02-29"));

// 输出 false

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12. 浮点数正则

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// 验证是否为浮点数

/^(?:[-+])?(?:[0-9]+)?(?:\.[0-9]*)?(?:[eE][\+\-]?(?:[0-9]+))?$/.test(0.2); // 输出 true

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13. Email正则

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// 验证Email/^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/.test("wowohoo@qq.com"); 

// 1.邮箱以a-z、A-Z、0-9开头，最小长度为1.

// 2.如果左侧部分包含-、_、.则这些特殊符号的前面必须包一位数字或字母。

// 3.@符号是必填项

// 4.右则部分可分为两部分，第一部分为邮件提供商域名地址，第二部分为域名后缀，现已知的最短为2位。

//   最长的为6为。

// 5.邮件提供商域可以包含特殊字符-、_、.

/^[a-z0-9]+([._\\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$/.test("wowohoo@qq.com");// 输出 true

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14. 校验传真号码

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// 国家代码(2到3位)-区号(2到3位)-电话号码(7到8位)-分机号(3位)

/^(([0\+]\d{2,3}-)?(0\d{2,3})-)(\d{7,8})(-(\d{3,}))?$/.test('021-5055455');// 输出 true

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15. 手机号正则

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/^1[34578]\d{9}$/.test("13611778887");

// 输出 true

//* 13段：130、131、132、133、134、135、136、137、138、139

//* 14段：145、147

//* 15段：150、151、152、153、155、156、157、158、159

//* 17段：170、176、177、178

//* 18段：180、181、182、183、184、185、186、187、188、189

//* 国际码 如：中国(+86)

/^((\+?[0-9]{1,4})|(\(\+86\)))?(13[0-9]|14[57]|15[012356789]|17[03678]|18[0-9])\d{8}$/.test("1

// 输出 true

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16. URL正则

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/^((https?|ftp|file):\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/.test("http://wangchujiang.com");

// 输出 true

// 获取url中域名、协议正则 'http://xxx.xx/xxx','https://xxx.xx/xxx','//xxx.xx/xxx'

/^(http(?:|s)\:)*\/\/([^\/]+)/.test("http://www.baidu.com");

// 输出 true

/^((http|https):\/\/(\w+:{0,1}\w*@)?(\S+)|)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/.test('https://www.baidu.com/s?wd=@#%$^&%$#');

// 输出 true

// 必须有协议

/^[a-zA-Z]+:\/\//.test("http://www.baidu.com");// 输出 true

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17. RGB Hex颜色正则

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/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/.test("#b8b8b8");

// 输出 true

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18. 车牌号正则

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/^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领A-Z]{1}[A-Z]{1}[A-Z0-9]{4}[A-Z0-9挂学警港澳]{1}$/.test("沪B99116");

// 输出 true

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19. 校验微信号

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// 6至20位，以字母开头，字母，数字，减号，下划线

/^[a-zA-Z]([-_a-zA-Z0-9]{5,19})+$/.test("jslite");

// 输出 true

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20. 校验QQ号

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// 5至11位

/^[1-9][0-9]{4,10}$/.test("398188661");// 输出 true

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相信看了这些案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！

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