regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
RegExr: Learn, Build, & Test RegEx
Menu RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a …
Regular expression - Wikipedia
A regular expression (shortened as regex or regexp), [1] sometimes referred to as a rational expression, [2][3] is a sequence of characters that specifies a match pattern in text.
RegExp - JavaScript | MDN
Nov 9, 2025 · The RegExp object is used for matching text with a pattern. For an introduction to regular expressions, read the Regular expressions chapter in the JavaScript guide. For …
JavaScript RegExp Patterns - W3Schools
/ regexp / is an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers: Well organized and easy to understand Web building tutorials with lots of examples of how to use …
Regular-Expressions.info - Regex Tutorial, Examples and ...
Oct 29, 2025 · A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids.
Regex Tutorial - A Cheatsheet with Examples - Regextutorial.org
Regular expressions or commonly called as Regex or Regexp is technically a string (a combination of alphabets, numbers and special characters) of text which helps in extracting …