Regular Expressions 101

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Community Patterns

1

YYMMDD Date with leap year

ECMAScript (JavaScript)
This expression validates any YYMMDD date, and insures that the leap year is accounted for. This is valid till 2099, 2100 is NOT a leap year.
Submitted by M. Fahmy - 2 hours ago
1

UUID v7

PCRE2 (PHP >=7.3)
Matching UUID v7 based on https://uuid7.com/ and related docs: https://uuid.ramsey.dev/en/stable/rfc4122/version7.html https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html#name-uuid-version-7
Submitted by DynamoRed - 2 days ago
1

Nigeria Phone Number Validation

PCRE2 (PHP >=7.3)
This regex will allow you validate the pattern of Nigeria phone number.
Submitted by Raymonbell - 2 days ago
1

Detect Even Numbers in any String

PCRE2 (PHP >=7.3)
Detects even numbers in any string: ex. Hello, I'm __18__ years old. ex. 17.02 (not detected)
Submitted by anonymous - 4 days ago
1

Check if even number

PCRE2 (PHP >=7.3)
Input a number and check if it is even
Submitted by anonymous - 4 days ago
1

Object Value JavaScript

ECMAScript (JavaScript)
Get object values in javascript. Get results with "$1". Example: myObject.replace(/"(.*?)"/g, "$1")
Submitted by zazer - 7 days ago (Last modified 7 days ago)
1

Extract & Parse URLs (Dec. 2024)

ECMAScript (JavaScript)
This version has a very high accuracy - few extraneous char matches. Very verbose, heavy usage of look-aheads, look-behinds, and mostly 'inclusive' character class matching. (as opposed to the exclusion strategy in this example)
Submitted by DanLevy.net - 10 days ago
1

ChatGPT multiline expressions for Obsidian Latex

Python
convert the multiline expressions into obsidian latex compatible. That is add - $$...$$
Submitted by myaitree - 12 days ago
1

Markdown Titles

Python
increase the head level of the markdown titles - that is add extra #.
Submitted by myaitree - 12 days ago
1

Mermaid brackets

Python
Mermaid brackets are enclosed in inverted commas for validity
Submitted by myaitree - 12 days ago
1

Comprehensive URL Validation Regex

Python
This regex pattern is designed to validate URLs with the following key features: Protocol Support: Optionally matches http:// or https://. Subdomain Handling: Supports optional www. and valid subdomains. Domain Name Validation: Ensures proper formatting of domain names: Prevents double hyphe...
Submitted by Hadi Mousavi - 15 days ago
1

Quality Value, RFC 9110 HTTP Semantics.

ECMAScript (JavaScript)
To extract the Quality Value (qvalue) according the RFC 9110 HTTP Semantics specifications from the weight of HTTP headers elements, like: Accept-Language Accept Accept-Charset Accept-Encoding TE...
Submitted by Daniel D'Leon - 19 days ago
1

[React TypeScript] - Unnecessary brackets around strings

ECMAScript (JavaScript)
Matches string properties that unnecessarily use brackets in React components. NOTE: If you're looking to harmonise your quote usage, use this substitution input: $1"$3$4" ...
Submitted by Nathanthanthan - 19 days ago (Last modified 19 days ago)
1

[React TypeScript] - Unnecessary backticks

ECMAScript (JavaScript)
Matches string properties that unnecessarily use backticks in React components. NOTE: This regex ignoes backtick strings that contain BOTH quotes (") AND single quotes (') but it WILL match backtick strings with ONLY quotes or ONLY single quotes! Keep this in mind if you want to use substitution! ...
Submitted by Nathanthanthan - 19 days ago (Last modified 19 days ago)
1

Regex for Validating Egyptian Mobile Numbers with Specific Operator Codes

PCRE2 (PHP >=7.3)
This regular expression is designed to validate Egyptian mobile phone numbers by ensuring they conform to the following format: Country Code: The number must start with +20, representing Egypt's international dialing code. Mobile Networks: (Vodafone: 10, e&:11, Orange:12, we:15) Operator Code: The ...
Submitted by Mohamed Amir - 21 days ago
1

punctuation detector

PCRE2 (PHP >=7.3)
removes punctuation
Submitted by anonymous - 22 days ago
1

Hexadecimal

ECMAScript (JavaScript)
Only matches if the entire string is in hexadecimal format
Submitted by anonymous - 23 days ago
1

Discord emoji & Markdown links

Rust
NOTE The word text is used to substitute all alphanumeric characters as well as underscores ([a-zA-Z0-9_]). Captures: ...
Submitted by anonymous - 25 days ago (Last modified 25 days ago)
1

js-br

ECMAScript (JavaScript)
teste
Submitted by anonymous - a month ago
1

Parse EPICS Substitution files

PCRE2 (PHP >=7.3)
Extracts the file name and substitution pattern for each entry in an EPICS substitution file. See https://docs.epics-controls.org/projects/base/en/latest/msi.html#dbloadtemplate-format for a description of the file format being parsed
Submitted by Giles Knap - a month ago
123...902

Community Library Entry

0

Regular Expression
PCRE (PHP <7.3)

/
(?(DEFINE) (?<currency_symbol> \p{Sc} ) (?<leading_group> [1-9] \d{0,2}+ ) (?<group> \d{3} ) (?<non_leading_groups> (?&group) (?:(?&group_delim)(?&group))*+ ) (?<decimal_delim> (?# Use the opposite of group_delim. ) (?(group_delim_comma) \. | (?(group_delim_period) , | [,.] (?# There's no definitive grouping_delim. ) ) ) ) ) ^ (?> (?&currency_symbol) (?&leading_group) (?: (?<group_delim> (?<group_delim_comma> , ) | (?<group_delim_period> \. ) | \ (?# Allow whitespace as a delimiter. ) ) (?&non_leading_groups) | \d*+ (?# It's also possible that there's no delimiter. ) ) ) (?: (?&decimal_delim) \d*+ )?+ $
/
guxm
Open regex in editor

Description

Matches typical currency input in most LTR locales. Doesn't handle ISO-style currency abbreviations. Currency symbol must be on the left side for consistency; this my conflict with conventions for some currencies. Requested by Mr Lucky at https://xenforo.com/community/threads/help-with-a-currency-regular-expression-please.104164/

Submitted by Paul Buonopane (Zenexer) - 9 years ago