A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation.
Regular expression techniques are developed in theoretical computer science and formal language theory. They are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are also supported in many programming languages.
Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.
📜 A Cheat-Sheet Collection from the WWW
Natural-language event parser for Javascript
Examples of Custom Secret Scanning Patterns for use with GitHub Secret Protection/Advanced Security
Proposal to add Unicode property escapes `\p{…}` and `\P{…}` to regular expressions in ECMAScript.
Regex collection for validating Iranian phone numbers + examples of writing in multiple languages such as Python, C#, Rust, etc. مجموعه بزرگ رجکس های بهینه (مرتبه زمانی O(1)) برای صحت سنجی شماره تلفن های ایرانی با تفکیک اوپراتور های مختلف و دقت بالا و مثال های پیاده سازی متعدد
A web tools to generate regular expressions from set of strings. https://ibnuhx.com/regex-generator
Quickly generate a regex for Discord's AutoMod that will protect your community from using leetspeak to bypass keyword rules.
Handling Strings in R
This is a source code repository of bregonig.dll regular expression library.
Regular expression for matching DOIs
Drop-in replacements for base R string functions powered by stringi
Course materials for Stat 133, Spring 2019, at UC Berkeley
a repository to help introduce and orient students to the GitHub collaboration environment, and to support DH classes.
ReGen is a utility tool simplifying Regex creation by selecting values from logs or text. It enhances efficiency for digital forensics, defense, validation, etc. Still in early stages, it aims to streamline Regex writing, boosting professionals' work efficiency.
Searchmonkey - Power searching without the pain. Perform powerful desktop searches using regular expressions. Graphical equivalent to find + grep.
Deterministic LLM contract checks for CI. Replays recorded fixtures, enforces schema/regex/budget rules, generates HTML/JUnit/JSON reports, and comments on PRs. Zero live model calls in CI.
Created by Stephen Cole Kleene
Released 1950