正则表达式

有了这25个正则表达式,代码效率提高80%

本文主要是介绍有了这25个正则表达式,代码效率提高80%,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

前言

大家好,我是林三心,在日常开发中,正则表达式是非常有用的,正则表达式在每个语言中都是可以使用的,他就跟JSON一样,是通用的。在日常开发中,了解一些常用的正则表达式,能大大提高你的工作效率,例如

  • 字符串的匹配

  • 表单项的格式校验

今天就给大家分享25个开发中常用的正则表达式吧!!!希望大家能提高代码效率!!!

https://img1.sycdn.imooc.com/616468dc0001b66a02240174.jpg

1、手机号码的校验

const phoneReg = /^[1][3,4,5,6,7,8,9][0-9]{9}$/


const phoneStr1 = '18886233487'

console.log(phoneReg.test(phoneStr1)) // true


const phoneStr2 = '17283017203897'

console.log(phoneReg.test(phoneStr2)) // false

2、身份证的校验

const sfzReg = /^[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]$/


const sfzStr1 = '415106199801012130'

console.log(sfzReg.test(sfzStr1)) // true


const sfzStr2 = '718381298381212183'

console.log(sfzReg.test(sfzStr2)) // false


3、邮箱的校验

const emailReg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/


const emailStrWY = '956666@163.com' // 163邮箱

const emailStrQQ = '956666@qq.com' // qq邮箱

console.log(emailReg.test(emailStrWY)) // true

console.log(emailReg.test(emailStrQQ)) // true


const noEmail = '72873213.com'

console.log(emailReg.test(noEmail)) // false


4、URL的校验

const urlReg = /^((https?|ftp|file):\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/


const urlStr1 = 'https://haha.sunshine.com/xxx/xxx'

console.log(urlReg.test(urlStr1)) // true


const urlStr2 = 'sss://haha.sunshine.com/xxx/xxx'

console.log(urlReg.test(urlStr2)) // false


5、IPv4的校验

const ipv4Reg = /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/


const ipv4Str1 = '122.12.56.65'

console.log(ipv4Reg.test(ipv4Str1)) // true


const ipv4Str2 = '122.12.56.655'

console.log(ipv4Reg.test(ipv4Str2)) // false


6、16进制颜色的校验

const color16Reg = /^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/


const color16Str1 = '#fff'

console.log(color16Reg.test(color16Str1)) // true


const color16Str2 = '#1234567'

console.log(color16Reg.test(color16Str2)) // false


7、日期 YYYY-MM-DD

const dateReg = /^\d{4}(\-)\d{1,2}\1\d{1,2}$/


const dateStr1 = '2021-10-10'

console.log(dateReg.test(dateStr1)) // true


const dateStr2 = '2021-01-01 1'

console.log(dateReg.test(dateStr2)) // false

8、日期 YYYY-MM-DD hh:mm:ss

const dateReg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/


const dateStr1 = '2021-10-10 16:16:16'

console.log(dateReg.test(dateStr1)) // true


const dateStr2 = '2021-10-10 16:'

console.log(dateReg.test(dateStr2)) // false

9、整数的校验

const intReg = /^[-+]?\d*$/


const intNum1 = 12345

console.log(intReg.test(intNum1)) // true


const intNum2 = 12345.1

console.log(intReg.test(intNum2)) // false

10、小数的校验

const floatReg = /^[-\+]?\d+(\.\d+)?$/


const floatNum = 1234.5

console.log(floatReg.test(floatNum)) // true


11、保留n位小数

function checkFloat(n) {

  return new RegExp(`^([1-9]+[\d]*(.[0-9]{1,${n}})?)$`)

}

// 保留2位小数

const floatReg = checkFloat(2)


const floatNum1 = 1234.5

console.log(floatReg.test(floatNum1)) // true


const floatNum2 = 1234.55

console.log(floatReg.test(floatNum2)) // true


const floatNum3 = 1234.555

console.log(floatReg.test(floatNum3)) // false

12、邮政编号的校验

const postalNoReg = /^\d{6}$/


const postalNoStr1 = '522000'

console.log(postalNoReg.test(postalNoStr1)) // true


const postalNoStr2 = '5220000'

console.log(postalNoReg.test(postalNoStr2)) // false

13、QQ号的校验

说明:5-11位数字

const qqReg = /^[1-9][0-9]{4,10}$/


const qqStr1 = '1915801633'

console.log(qqReg.test(qqStr1)) // true


const qqStr2 = '191580163333'

console.log(qqReg.test(qqStr2)) // false

14、微信号的校验

说明:6至20位,以字母开头,字母,数字,减号,下划线

const wxReg = /^[a-zA-Z]([-_a-zA-Z0-9]{5,19})+$/


const wxStr1 = 'linsanxin885577'

console.log(wxReg.test(wxStr1)) // true


const wxStr2 = '厉害了我的vx'

console.log(wxReg.test(wxStr2)) // false

15、车牌号的校验

const carNoReg = /^[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}$/


const carNoStr1 = '粤A12345'

console.log(carNoReg.test(carNoStr1)) // true


const carNoStr2 = '广东A12345'

console.log(carNoReg.test(carNoStr2)) // false

16、只含字母的字符串

const letterReg = /^[a-zA-Z]+$/


const letterStr1 = 'sunshineLin'

console.log(letterReg.test(letterStr1)) // true


const letterStr2 = 'sunshine_Lin'

console.log(letterReg.test(letterStr2)) // false

17、包含中文的字符串

const cnReg = /[\u4E00-\u9FA5]/


const cnStr1 = '我是sunshine_Lin,林三心'

console.log(cnReg.test(cnStr1)) // true


const cnStr2 = 'sunshine_Lin'

console.log(cnReg.test(cnStr2)) // false

18、密码强度的校验

说明:密码中必须包含字母、数字、特称字符,至少8个字符,最多30个字符

const passwordReg = /(?=.*[0-9])(?=.*[a-zA-Z])(?=.*[^a-zA-Z0-9]).{8,30}/


const password1 = 'sunshine_Lin12345..'

console.log(passwordReg.test(password1)) // true


const password2 = 'sunshineLin12345'

console.log(passwordReg.test(password2)) // false

19、字符串长度n的校验

function checkStrLength(n) {

  return new RegExp(`^.{${n}}$`)

}


// 校验长度为3的字符串

const lengthReg = checkStrLength(3)


const str1 = 'hhh'

console.log(lengthReg.test(str1)) // true


const str2 = 'hhhhh'

console.log(lengthReg.test(str2)) // false

20、文件拓展名的校验

function checkFileName (arr) {

  arr = arr.map(name => `.${name}`).join('|')

  return new RegExp(`(${arr})$`)

}


const filenameReg = checkFileName(['jpg', 'png', 'txt'])


const filename1 = 'sunshine.jpg'

console.log(filenameReg.test(filename1)) // true

const filename2 = 'sunshine.png'

console.log(filenameReg.test(filename2)) // true

const filename3 = 'sunshine.txt'

console.log(filenameReg.test(filename3)) // true

const filename4 = 'sunshine.md'

console.log(filenameReg.test(filename4)) // false

21、匹配img和src

const imgReg = /<img.*?src=[\"|\']?(.*?)[\"|\']?\s.*?>/ig


const htmlStr = '<div></div><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine.png" /><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine111.png" />'


console.log(imgReg.exec(htmlStr))

// [

//   '<img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine.png" />',

//   'sunshine.png',

//   index: 11,

//   input: '<div></div><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine.png" /><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine111.png" />',

//   groups: undefined

// ]

console.log(imgReg.exec(htmlStr))

// [

//   '<img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine111.png" />',

//   'sunshine111.png',

//   index: 37,

//   input: '<div></div><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine.png" /><img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="sunshine111.png" />',

//   groups: undefined

// ] 

22、匹配html中的注释

const noteReg = /<!--(.*?)-->/g


const htmlStr = '<!--一个div标签--> <div></div> <!--一个div标签--> <div></div>'


console.log(noteReg.exec(htmlStr))

// [

//   '<!--一个div标签-->',

//   '一个div标签',

//   index: 0,

//   input: '<!--一个div标签--> <div></div> <!--一个div标签--> <div></div>',

//   groups: undefined

// ]

console.log(noteReg.exec(htmlStr))

// [

//   '<!--一个div标签-->',

//   '一个div标签',

//   index: 27,

//   input: '<!--一个div标签--> <div></div> <!--一个div标签--> <div></div>',

//   groups: undefined

// ]

23、匹配html中的style

const styleReg = /style="[^=>]*"([(\s+\w+=)|>])/g


const htmlStr = '<div style="background:#000;"><span style="color:#fff"></span></div>'


console.log(styleReg.exec(htmlStr))

// [

//   'style="background:#000;">',

//   '>',

//   index: 5,

//   input: '<div style="background:#000;"><span style="color:#fff"></span></div>',

//   groups: undefined

// ]

console.log(styleReg.exec(htmlStr))

// [

//   'style="color:#fff">',

//   '>',

//   index: 36,

//   input: '<div style="background:#000;"><span style="color:#fff"></span></div>',

//   groups: undefined

// ]

24、匹配html中的颜色

const colorReg = /#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/g


const htmlStr = '<div style="background:#000;"><span style="color:#fff"></span></div>'


console.log(colorReg.exec(htmlStr))

// [

//   '#000',

//   '000',

//   index: 23,

//   input: '<div style="background:#000;"><span style="color:#fff"></span></div>',

//   groups: undefined

// ]

console.log(colorReg.exec(htmlStr))

// [

//   '#fff',

//   'fff',

//   index: 49,

//   input: '<div style="background:#000;"><span style="color:#fff"></span></div>',

//   groups: undefined

// ]

25、匹配htmlTag(html标签)

const endReg = /<("[^"]*"|'[^']*'|[^'">])*>/g


const htmlStr = '<div style="background:#000;"><span style="color:#fff"></span></div><h1></h1>'


console.log(endReg.exec(htmlStr))

console.log(endReg.exec(htmlStr))

console.log(endReg.exec(htmlStr))

console.log(endReg.exec(htmlStr))

console.log(endReg.exec(htmlStr))

console.log(endReg.exec(htmlStr))


作者:Sunshine_Lin
链接:https://juejin.cn/post/7016871226899431431
来源:稀土掘金
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。



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