Regular Expressions 101

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Community Patterns

1

Credit Cart Prediction & Validation

ECMAScript (JavaScript)
Credit Card Carrier Prediction This regex is specifically designed to predict from the first few characters which carrier type the credit card number is.
Submitted by anonymous - 17 days ago (Last modified 15 days ago)
1

ISO 8601 DURATION - Terraform Validation

Golang
This is made to validate an ISO 8601 input in a Terraform variable validation block: validation { condition = can(regex("^P(\\d+Y)?(\\d+M)?(\\d+D)?(T(\\d+H)?(\\d+M)?(\\d+S)?)?$", var.value)) error_message = "The value must be a valid ISO 8601 duration string representing time. (e.g. PT...
Submitted by anonymous - 21 days ago
1

Slash Separated Numbers

Golang
...
Submitted by Anonymous - 23 days ago
1

Search for markup elements with an attribute

ECMAScript (JavaScript)
In this example we are searching for all element/component in JSX that have the is="secondary" prop. This regex was tested with VS Code
Submitted by anonymous - a month ago
1

short IPV4 Capture

ECMAScript (JavaScript)
(?(?:(?:25[0-5]|(?:2[0-4]|1\d|[1-9]|)\d)\.?\b){4}) Originating from ^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$ at only 43 chars Source: Danail Gabenski
Submitted by 0xp - a month ago
1

Teste RISOLUTO button com span ícone

ECMAScript (JavaScript)
Teste
Submitted by risoluto - a month ago
1

Class name validator

ECMAScript (JavaScript)
Validate if class name pass this criteria: A valid name should start with a letter (a-z)[A-Z] , an underscore (_), or a hyphen (-) which is followed by any numbers, hyphens, underscores, letters. A name should be at least two characters long. Cannot start with a digit, two hyphens or a hyphen fo...
Submitted by Agustín Bouillet - a month ago
1

Bitbucket URL Parser

ECMAScript (JavaScript)
A regular expression for extracting the author, repository name, and optional branch from a Bitbucket repository or tree URL. Handles both HTTP(S) and direct Bitbucket links.
Submitted by Xain - a month ago
1

GitLab URL Parser

ECMAScript (JavaScript)
A regular expression for extracting the author, repository name, and optional branch from a GitLab repository or tree URL. Handles both HTTP(S) and direct GitLab links.
Submitted by Xain - a month ago (Last modified a month ago)
1

GitHub URL Parser

ECMAScript (JavaScript)
A regular expression for extracting the author, repository name, and optional branch from a GitHub repository or tree URL. Handles both HTTP(S) and direct GitHub links.
Submitted by Xain - a month ago
1

Discord - Command Name

ECMAScript (JavaScript)
Verification of Application Command names for Discord's API. Useful for Discord applications. Source : discord.dev
Submitted by volcanofr - a month ago
1

Word Pattern

ECMAScript (JavaScript)
Word Patterns - multilanguage Separating words that handle many use cases I needed, more than simple /\bword\b/gi. Below are some targeted test cases and acceptable failed cases: ...
Submitted by Bryan Ho - a month ago
1

url_validation_url_doğrulama

ECMAScript (JavaScript)
^ - This signifies the start of the expression. https?:// - This matches either "http://" or "https://". (www.)? - This makes the "www." subdomain optional. [A-z0-9]+ - This matches one or more alphanumeric characters for the domain name. . - This matches a literal period character. [A-z0-9]+ - This...
Submitted by Emre Yıldırım - 2 months ago
1

Timestamp Regex

ECMAScript (JavaScript)
matches a timestamp that is in the format of Aug 14, 2024, 10:12 AM or month shortcode followed by day, year, time in 12 hours
Submitted by astro - 2 months ago
1

german date era with tolerance: n. Chr. or v. Chr. / n. Ztr of v. Ztr

ECMAScript (JavaScript)
Maches german era notations in date "v. Chr" and "v. Ztr" It is meant to be tolerant : periods and spaces are optional, and it is case insensitive
Submitted by Olivier CHEVET - 2 months ago
1

Split Docker image into image name, tag and digest with all optional

Golang
Splits a Docker image string into the separate parts: image, tag, digest tag and digest are optional
Submitted by Roemer - 2 months ago
1

E-mail pattern for html input.

ECMAScript (JavaScript)
Simply e-mail pattern for html tag.
Submitted by KsaR99 - 2 months ago
1

Simple but powerful email

ECMAScript (JavaScript)
"/" - start of regular expression "^" - anchor to beginning of string Group: [a-z0-9]+ "[a-z0-9]" - Latin character or digit "+" - occurring ONE or more times...
Submitted by Diableros [https://github.com/Diableros] - 2 months ago (Last modified 2 months ago)
1

ObjAction(\s+\=|\=)(\s+\[|\[).*?\;

ECMAScript (JavaScript)
asdad
Submitted by anonymous - 2 months ago (Last modified 2 months ago)
3

**japanese text** to bold <b>japanese text</b>

PCRE (PHP <7.3)
japanese text to bold japanese text 食べるんだ 食べるんだ
Submitted by kurokuroshii - 2 months ago (Last modified 2 months ago)
123...643

Community Library Entry

1

Regular Expression
ECMAScript (JavaScript)

/
^(?:(?:[1-9]?[0-9]|1[0-9][0-9]|2(?:[0-4][0-9]|5[0-5]))\.){3}(?:[1-9]?[0-9]|1[0-9][0-9]|2(?:[0-4][0-9]|5[0-5]))(?:\/(?:[12]?[0-9]|3[0-2]))?$
/
Open regex in editor

Description

Matches any valid IPv4 address with, optionally, a CIDR suffix.

0.0.0.0 to 255.255.255.255 and 1.1.1.1/0 to 1.1.1.1/32.

Use the following regex if you don't want to allow the CIDR suffix.

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

(removed (?:\/(?:[12]?[0-9]|3[0-2]))? from the end)

Submitted by MAZ01001 - 8 months ago