常用正则表达式备忘单

Commonly used Regex

1. Digits

Whole Numbers – /^\d+$/
Decimal Numbers – /^\d*\.\d+$/
Whole + Decimal Numbers – /^\d*(\.\d+)?$/
Negative, Positive Whole + Decimal Numbers – /^-?\d*(\.\d+)?$/
Whole + Decimal + Fractions – /[-]?[0-9]+[,.]?[0-9]*([\/][0-9]+[,.]?[0-9]*)*/

2. Alphanumeric Characters

Alphanumeric without space – /^[a-zA-Z0-9]*$/
Alphanumeric with space – /^[a-zA-Z0-9 ]*$/

3. Email

Common email Ids – /^([a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,6})*$/
Uncommon email ids – /^([a-z0-9_\.\+-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/

4. Password Strength

Complex: Should have 1 lowercase letter, 1 uppercase letter, 1 number, 1 special character and be at least 8 characters long
/(?=(.*[0-9]))(?=.*[\!@#$%^&*()\\[\]{}\-_+=~`|:;"'<>,./?])(?=.*[a-z])(?=(.*[A-Z]))(?=(.*)).{8,}/
Moderate: Should have 1 lowercase letter, 1 uppercase letter, 1 number, and be at least 8 characters long
/(?=(.*[0-9]))((?=.*[A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z]))^.{8,}$/

5. Username

Alphanumeric string that may include _ and – having a length of 3 to 16 characters – /^[a-z0-9_-]{3,16}$/

6. URL

Include http(s) Protocol

/https?:\\/\\/(www\\.)?\[-a-zA-Z0-9@:%.\_\\+~#=\]{2,256}\\.\[a-z\]{2,6}\\b(\[-a-zA-Z0-9@:%\_\\+.~#()?&//=\]\*)/

Protocol Optional

/(https?:\\/\\/)?(www\\.)?\[-a-zA-Z0-9@:%.\_\\+~#=\]{2,256}\\.\[a-z\]{2,6}\\b(\[-a-zA-Z0-9@:%\_\\+.~#?&//=\]\*)/

7. IP Address

IPv4 address

/^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/

IPv6 address

/(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80::[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]{0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))/

Both IPv4, IPv6 addresses

/((^\s*((([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))\s*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$))/`

8. Dates

Date Format YYYY-MM-dd using separator -/([12]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01]))/
Date Format dd-MM-YYYY using separators - or . or //^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$/
Date Format dd-mmm-YYYY using separators - or . or //^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]|(?:Jan|Mar|May|Jul|Aug|Oct|Dec)))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2]|(?:Jan|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)(?:0?2|(?:Feb))\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9]|(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep))|(?:1[0-2]|(?:Oct|Nov|Dec)))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$/

9. Time

Time Format HH:MM 12-hour, optional leading 0

/^(0?[1-9]|1[0-2]):[0-5][0-9]$/

Time Format HH:MM 12-hour, optional leading 0, Meridiems (AM/PM)

/((1[0-2]|0?[1-9]):([0-5][0-9]) ?([AaPp][Mm]))/

Time Format HH:MM 24-hour with leading 0

/^(0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/

Time Format HH:MM 24-hour, optional leading 0

/^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/

Time Format HH:MM:SS 24-hour

/(?:[01]\d|2[0123]):(?:[012345]\d):(?:[012345]\d)/

10. HTML Tags

Elements with Attributes /<\/?[\w\s]*>|<.+[\W]>/

11. Javascript Handlers

Inline JS handler /\bon\w+=\S+(?=.*>)/
Inline JS handler with element /(?:<[^>]+\s)(on\S+)=["']?((?:.(?!["']?\s+(?:\S+)=|[>"']))+.)["']?/

12. Slug

Slug /^[a-z0-9]+(?:-[a-z0-9]+)*$/

13. Match Duplicates in a String

Search Duplicates /(\b\w+\b)(?=.*\b\1\b)/

14. Phone Numbers

International Phone Numbers – with optional country code/extension

`/* International Phone Numbers */`
/^(?:(?:\(?(?:00|\+)([1-4]\d\d|[1-9]\d?)\)?)?[\-\.\ \\\/]?)?((?:\(?\d{1,}\)?[\-\.\ \\\/]?){0,})(?:[\-\.\ \\\/]?(?:``#|ext\.?|extension|x)[\-\.\ \\\/]?(\d+))?$/

Note: Use regex for validating phone numbers only if you don’t have the choice to use a library. There are several libraries that handle phone numbers more accurately and should be used instead.

15. File Path

File Path with Filename and extension

/((\\/|\\\\|\\/\\/|https?:\\\\\\\\|https?:\\/\\/)\[a-z0-9 \_@\\-^!#$%&+={}.\\/\\\\\\\[\\\]\]+)+\\.\[a-z\]+$/

File Path with optional Filename, extension

/^(.+)/(\[^/\]+)$/

File Name with extension having 3 chars

/^\[\\w,\\s-\]+\\.\[A-Za-z\]{3}$/

Additional Regexes

1. Zip codes

There is NO single Regex that can handle all zip codes given that zip codes around the world do not follow a common pattern. Here is a list that contains Regex specific to each country.

2. Payment Validation

Here is a link that contains regex for validating leading Credit cards like Visa, Mastercard and so on.

3. Identity Documents

Social Security Number – Ref

/\* can use either hypen(-) or space( ) character as separator \*/

/^((?!219-09-9999|078-05-1120)(?!666|000|9\\d{2})\\d{3}-(?!00)\\d{2}-(?!0{4})\\d{4})|((?!219 09 9999|078 05 1120)(?!666|000|9\\d{2})\\d{3} (?!00)\\d{2} (?!0{4})\\d{4})|((?!219099999|078051120)(?!666|000|9\\d{2})\\d{3}(?!00)\\d{2}(?!0{4})\\d{4})$/