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
// ]

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