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 …

IETF RFC 9485 describes "I-Regexp: An Interoperable Regular Expression Format". It specifies a limited subset of regular-expression idioms designed to be interoperable, i.e. produce the same …

Dec 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, …

Apr 12, 2024 · Regular expressions are a generalized way to match patterns with sequences of characters. It is used in every programming language like C++, Java and Python. What is a regular …

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.

2 days ago · Regular Expression Syntax ¶ A regular expression (or RE) specifies a set of strings that matches it; the functions in this module let you check if a particular string matches a given regular …

Here is a quick tutorial for you to learn regular expressions, you can see the details about each individual topic also.

Regular Expression Library provides a searchable database of regular expressions. Users can add, edit, rate, and test regular expressions.