Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.

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 match or …

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.

Jul 8, 2025 · This page provides an overall cheat sheet of all the capabilities of RegExp syntax by aggregating the content of the articles in the RegExp guide. If you need more information on a …

/ 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 HTML, CSS, …

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 information from text by …

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.

Test, debug, and visualize your regular expressions in real-time with our live regex tester. Features include syntax highlighting, a regex cheat sheet, and a library of common regex patterns. Perfect for …

Apr 14, 2022 · In this article, we’ll focus on the ECMAScript variant of Regex, which is used in JavaScript and shares a lot of commonalities with other languages’ implementations of regex as well. …

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 detailed information …