Summary of the 20 most commonly used regular expressions

In daily development, regular expressions are very useful. Knowing some commonly used regular expressions can greatly improve your work efficiency, such as string matching, format verification of form items, etc. Today I will share 20 of them with you. Commonly used regular expressions in development! ! ! Hope to help you improve code efficiency


  1. Verification of mobile phone number

    const phoneReg = ^\+[1-9]{1}[0-9]{7,11}$    
const phoneStr1 = '18888888888'
console.log(phoneReg.test(phoneStr1)) // true


  2. Verification of ID card

    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. Email verification

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


  4. URL verification

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

const urlStr1 = 'https://haha.fryao.com/xxx/xxx'
console.log(urlReg.test(urlStr1)) // true

const urlStr2 = 'sss://haha.fryao.com/xxx/xxx'
console.log(urlReg.test(urlStr2)) // false


  5. IPv4 verification

    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. Verification of hexadecimal color

    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. Date YYYY-MM-DD

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

const dateStr1 = '2022-11-10'
console.log(dateReg.test(dateStr1)) // true

const dateStr2 = '2022-01-01 1'
console.log(dateReg.test(dateStr2)) // false


  8. Date 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 = '2022-11-10 16:16:16'
console.log(dateReg.test(dateStr1)) // true

const dateStr2 = '2022-11-10 16:'
console.log(dateReg.test(dateStr2)) // false


  9. Integer verification

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

const intNum1 = 12345
console.log(intReg.test(intNum1)) // true

const intNum2 = 12345.1
console.log(intReg.test(intNum2)) // false


  10. Checking of decimals

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

const floatNum = 1234.5
console.log(floatReg.test(floatNum)) // true


  11. Keep n decimal places

    function checkFloat(n) {
   return new RegExp(`^([1-9]+[\d]*(.[0-9]{1,${n}})?)$`)
}
// retain 2 decimal places
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. Verification of QQ number Description: 5-11 digits: 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


  13. Micro-signal verification
    Description: 6 to 20 digits, starting with a letter, letter, number, minus sign, underscore:

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

const wxStr1 = 'linsanxin885577'
console.log(wxReg.test(wxStr1)) // true

const wxStr2 = '!vx'
console.log(wxReg.test(wxStr2)) // false


  14. Strings containing only letters

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

const letterStr1 = 'fryao'
console.log(letterReg.test(letterStr1)) // true

const letterStr2 = 'f_yao'
console.log(letterReg.test(letterStr2)) // false


  15. Strings containing Chinese

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

const cnStr1 = '我是fryao，方日尧'
console.log(cnReg.test(cnStr1)) // true

const cnStr2 = 'fr_yao'
console.log(cnReg.test(cnStr2)) // false


  16. Verification of password strength Note: The password must contain letters, numbers, and special characters, at least 8 characters, and a maximum of 30 characters

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

const password1 = 'f_ryao12345..'
console.log(passwordReg.test(password1)) // true

const password2 = 'fryao12345'
console.log(passwordReg.test(password2)) // false


  17. Verification of string length n

    function checkStrLength(n) {
   return new RegExp(`^.{${n}}$`)
}

// check string with length 3
const lengthReg = checkStrLength(3)

const str1 = 'hhh'
console.log(lengthReg.test(str1)) // true

const str2 = 'hhhhh'
console.log(lengthReg.test(str2)) // false


  18. Verification of file extension

    function checkFileName (arr) {
  arr = arr.map(name => `.${name}`).join('|')
  return new RegExp(`(${arr})$`)
}

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

const filename1 = 'fryao.jpg'
console.log(filenameReg.test(filename1)) // true
const filename2 = 'fryao.txt'
console.log(filenameReg.test(filename2)) // true
const filename3 = 'fryao.md'
console.log(filenameReg.test(filename4)) // false


  19. Match comments in html

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

const htmlStr = '<!--a div tag--> <div></div> <!--a div tag--> <div></div>'

console.log(noteReg.exec(htmlStr))
//[
// '<!--a div tag -->',
// 'A div tag',
// index: 0,
// input: '<!--a div tag--> <div></div> <!--a div tag--> <div></div>',
// groups: undefined
// ]
console.log(noteReg.exec(htmlStr))
//[
// '<!--a div tag -->',
// 'A div tag',
// index: 27,
// input: '<!--a div tag--> <div></div> <!--a div tag--> <div></div>',
// groups: undefined
// ]


  20. Match the style in html

    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
// ]

Popular posts from this blog

大学资料分享——广工计院各个科目实验报告、课设及期末复习资料！！

各位师弟师妹，我今年即将从广工毕业，因工作毕设都已差不多完成，整理资料时最终还是决定分享自己大学期间积累的各科资料。本人是广工计院一名本科生，在校绩点四年综合4.0左右，我相信这些资料对你们的学习和实验有非常大的实用性和价值。也真心希望大家能做好时间效率管理，一些不必要的课程不用浪费很多时间，把时间多留给自己所走的方向，希望各位师弟师妹好好利用我的资料，提升自己。如果本篇文章对你有帮助，请多来网站阅览并点击下页面的谷歌广告支持一下，十分感谢~~ 本博客除资源分享外还会 定期发布前端相关的行业动态、前端面试题系列等，后续也会逐步将自己的秋招总结发到谷歌博客上，同方向的师弟师妹们可以关注下，毕竟我也是在最寒冬秋招中获得好几个知名厂offer的，相信对你们将来的工作和面试也会非常实用 。 University special design: Specialised design IPV6 Experiment Report: GDUT IPV6 GDUT matlab digital signal processing experiment report: Matlab Experiment Report The latest operating system experiment and course design report: OS Experiment Report Virtualization and Cloud Computing-Hadoop Deployment Experiment Report: Hadoop Report GDUT C language programming experiment report 1-4: C language programming experiment report Summary of Physics Data of GDUT ： Physics GDUT DEA experiment + big assessment (source code, waveform diagram) + test paper information： EDA Data summary of GDUT Electrician： University Ele...
Read more

JAVA Traffic Signal Light Course Design (Source Code + Report + Video Demonstration)

Image
Table Of Contents topic details Simulate the logic of the traffic light management system at the intersection. 1. Randomly generate vehicles traveling along each route 2. Signal lights ignore yellow lights and only consider red and green lights. 3. It should be considered that vehicles turning left are controlled by signal lights, and vehicles turning right are not controlled by signal lights. 4. The specific signal light control logic is the same as that of ordinary traffic light control logic in real life, regardless of the control logic in special cases: North-south vehicles and east-west vehicles are released alternately. Vehicles waiting in the same direction should pass through vehicles first, and then vehicles turning left. 5. The time for each vehicle to pass through the intersection is 1 second (reminder: it can be simulated by thread sleep). 6. The time interval for randomly generating vehicles and the time interval for exchanging traffic lights i...
Read more

Win10 远程计算机或设备将不接受连接

Image
Table Of Contents 错误详情 当晚如平常一样开着clash，但谷歌浏览器显示此网站无法提供安全连接，按网上说的方法改https为http、清除SSL状态缓存、还原浏览器默认设置三个方法后还是没能解决，想起重启能解决99%的问题后果断重启电脑，这也是后面悲剧的开始。 电脑重启后，发现打开浏览器依然无法上网，且火狐浏览器等都出现了一样的问题，通过网络诊断得出原因：远程计算机或设备将不接受连接 百度后发现网上的解决方法千篇一律，都是通过Internet——属性——连接——局域网设置——为LAN使用代理服务器的选项去掉勾选就可恢复（也有说将所有复选框都取消勾选） 我满怀希望的尝试后发现然并卵，虽然提示网络状态已连接Internet但是上不了网。。。后来想了想，可能是因为自己用了翻墙上网然后没有退出就重启的关系（如果没用梯子的兄弟姐妹们可以先尝试我上述的方法，行不通的话再试试我后面的方法） 解决方法 可先尝试重新连接关机时使用的翻墙软件 并正常退出，即可访问网络，如果不行再按以下方法 。 非校园网 重置网络：Internet属性——高级——重置 用了科学上网的同学可能I nternet属性 的常规里主页地址会被篡改，可以手动输入成百度地址 设置完成后点确定，然后重启电脑，此时就能恢复访问了。但出错时如果是用着校园网没有退出科学上网就重启的话，此时用校园网还是上不了网，只能用手机开热点的网络上网，于是进一步摸索 校园网 1.先按非校园网方法重置网络 2.删除电脑科学上网的软件 3.重新认证校园网（可以改个密码重新登录） 呜呜，孩子终于又通网了 总结 科学上网时一定要正常进出网络，不能直接关电脑或者断网，否则IP地址还挂在外面网络回不来，所以记得科学上网时 正常退出后再重启电脑 。
Read more