RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
regex101: build, test, and debug regex
Online regex tester and debugger with real-time match highlighting, detailed explanations, substitutions, unit tests, benchmarking, …
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 …
RegExp - JavaScript | MDN - MDN Web Docs
Nov 9, 2025 · The RegExp () constructor directly returns the pattern argument only if pattern is a regex (among a few other …
JavaScript RegExp Patterns - W3Schools
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like …
Regular expression syntax cheat sheet - JavaScript | MDN
Mar 17, 2026 · Regular expression syntax cheat sheet This page provides an overall cheat sheet of all the capabilities of RegExp …
JavaScript Regular Expressions - W3Schools
JavaScript RegExp Quantifiers Quantifiers define the numbers of characters or expressions to match.
Regular-Expressions.info - Regex Tutorial, Examples and Reference ...
Jun 30, 2026 · A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think …
Regex Cheat Sheet
Regular Expressions Syntax Reference. Includes tables showing syntax, examples and matches.
Regexp Online - build, test, debug, search and replace regex
Build, test and debug regular expressions: find matches, inspect capture groups and replace text directly in your browser on …