Regular Expressions 101

Order By

Sponsors
There are currently no sponsors. Become a sponsor today!

Community Patterns

3

Sql Injection detection

ECMAScript (JavaScript)
this regex detect any sql injections .
Submitted by Saeed.Tabrizi@gamil.com - 8 years ago
3

Email

Python
Python
Submitted by anonymous - 8 years ago
3

Markdown link rewriting

ECMAScript (JavaScript)
A regular expression which finds all instances of markdown links and helps with rewriting link paths.
Submitted by Will Vaughn - 8 years ago
3

Thorough UK Postcode Validator with In/Out code capture groups

Python
A more thorough UK postcode validator tested against all UK postcodes on a regular basis, but excluding the special GIRO postcode case out of personal preference. Additionally has capture groups for the In-code and Out-code sections. Requires case insensitive matching.
Submitted by Chris G - 8 years ago
3

Hostname validation

Golang
Validates subdomain, root domain, and wild card domains
Submitted by AnonymousDapper - 8 years ago
1

Regex to match any JSON value with fewer steps possible

PCRE (PHP <7.3)
If you find... any JSON value that should be matched but isn't, any JSON value that should NOT be matched but is or simply a way to match the values with fewer steps... please, let me know.
Submitted by anonymous - 6 years ago
3

HSL(A) Color Matching

PCRE (PHP <7.3)
This allows for both hsl and hsla color patterns to be matched. hsla(50.5deg, .531%, .9%, 1.0) The hue can be matched without the word deg. Hue is from 0-360 Percentage allows for decimals. Percentage is from 0-100%...
Submitted by anonymous - 5 years ago
2

Regex tutorial

Java 8
Case insensitive match the whole word betwween \bword\b
Submitted by anonymous - 4 years ago (Last modified a year ago)
3

Full Best URL Regex Match

PCRE (PHP <7.3)
Best Full URL Regex to match URL, This is simple and can match 64K of url regex under 77ms Regex Matches All Below and more: https://example.domain http://example.domain...
Submitted by divineniiquaye - 4 years ago
3

National Insurance Number regular expression

PCRE2 (PHP >=7.3)
This regular expression is build from the description of NINO number of GOV.UK,
Submitted by Iftakhar Husan - 4 years ago
3

Email

ECMAScript (JavaScript)
This is a bit simpler version that is still quite robust. It was taken from a Formik example.
Submitted by codefinity - 4 years ago
3

Livestock - Visual tag and Back tag

PCRE2 (PHP >=7.3)
Visual tag and Back tag cannot more than 15 characters or only can contain uppercase, lowercase, space and dash.
Submitted by Adrian Yim - 4 years ago
3

discord invite link

ECMAScript (JavaScript)
detect discord invite links such as: discord.gg/link discord.com/invite/link .gg/link .com/invite/link...
Submitted by padero - 4 years ago
3

camelCase2snake_case

PCRE2 (PHP >=7.3)
Convert camelCase to snake_case def camelCase2snake_case(txt): """ Convert camelCase to snake_case https://regex101.com/library/wUcSv4...
Submitted by JV-conseil - 2 years ago
3

Discord ID:NAME#DISCRIM match

PCRE2 (PHP >=7.3)
For example, using `Carl-bot to dump members of the @everyone role ordering highest of id`: `!dump @everyone %i:%u -o id` Example of return: 498984530968051713:lanjt#2129 ......
Submitted by lanjt - 3 years ago
3

mega.nz files and folders

PCRE2 (PHP >=7.3)
Regex for matching https://mega.nz file and folder URLs. https://github.com/tonikelope/megabasterd/issues/215
Submitted by anonymous - 3 years ago
2

Regex for real number

ECMAScript (JavaScript)
this regex can detect any real number whether it is signed or unsigned.plus it can detect real number both with and without floating point aka '.'.the numbers should be decimal number
Submitted by Adnan nabib - 3 years ago
3

example

PCRE2 (PHP >=7.3)
example
Submitted by anonymous - 3 years ago
3

Viet Nam Phone Number

ECMAScript (JavaScript)
Viet Nam Phone Number Regex. This regex include: Cellphone number: Viettel, Vinaphone, Mobiphone, Vietnamobile, Iteltelecom, Reddi (055) Telephone number (such as: 024, 028,...) Start with Exactly 10 or 11 numbers
Submitted by tuangt12 - 3 years ago
2

CSS Colors: RGB(A), HSL(A), HEX(3,4,6,8), var(--tw-color), etc...

ECMAScript (JavaScript)
Versatile, multiline matching of CSS colors of many common formats, including: [x] HEX-3: #123 (equivalent to #112233) [x] HEX-4: #FA0F ( ... #FFAA00FF) [x] HEX-6: #FF3300 ( ...#F30) [x] HEX-8: #FFAA00FF ( ...#FA0F)...
Submitted by Nicholas Berlette (@nberlette) - 3 years ago
1...3536373839...901

Community Library Entry

2

Regular Expression
ECMAScript (JavaScript)

/
^\s*(color|background[-color]*||[a-zA-Z0-9-_]+)??[\s:=]*[\s]*(?:(\b(rgb)\s*?\(\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?,\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?,\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?\))|(\b(rgba)\s*?\(\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?,\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?,\s*?(000|0?\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\s*?,\s*?(0|0\.\d*|1|1.0*)\s*?\))\B|(\b(transparent)|(inherit)|(initial)|(currentColor)|(var)[(]([-]{2}[^)]+)[)])|(#([a-fA-F0-9]){3,4})|(#([a-fA-F0-9]){6,8})|(\b(hsl)\s*?\(\s*?(000|0?\d{1,2}|[1-2]\d\d|3[0-5]\d|360)\s*?,\s*?(000|100|0?\d{2}|0?0?\d)%\s*?,\s*?(000|100|0?\d{2}|0?0?\d)%\s*?\)$)|(\b(hsla)\s*?\(\s*?(000|0?\d{1,2}|[1-2]\d\d|3[0-5]\d|360)\s*?,\s*?(000|100|0?\d{2}|0?0?\d)%\s*?,\s*?(000|100|0?\d{2}|0?0?\d)%\s*?,\s*?(0|0\.\d*|1|1.0*)\s*?\)\b))
/
gm
Open regex in editor

Description

Versatile, multiline matching of CSS colors of many common formats, including:

  • HEX-3: #123 (equivalent to #112233)
  • HEX-4: #FA0F ( ... #FFAA00FF)
  • HEX-6: #FF3300 ( ...#F30)
  • HEX-8: #FFAA00FF ( ...#FA0F)
  • RGB: rgb(0, 0, 0)
  • RGBA: rgba(255, 255, 255, 1.0)
  • HSL: hsl(100, 50%, 50%)
  • HSLA: hsla(100, 20%, 20%, 1.0)
  • Vars: var(--tw-color-name, #000000)
  • Misc: color: inherit; color: currentColor; color: initial;, etc.
  • With or without trailing semicolon or comma
  • Forgiving of whitespace issues
  • Allows property/declaration names (e.g. color: #fff), most other solutions do not.
Submitted by Nicholas Berlette (@nberlette) - 3 years ago