regex101: build, test, and debug regex
Online regex tester and debugger with real-time match highlighting, detailed explanations, substitutions, unit tests, benchmarking, …
RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
Regular expression - Wikipedia
The phrase regular expressions, or regexes, is often used to mean the specific, standard textual syntax for representing patterns for …
Regex Tutorial - How to write Regular Expressions
Dec 22, 2025 · A regular expression (regex) is a sequence of characters that defines a search pattern. It is mainly used for pattern …
Regex Cheat Sheet - rexegg.com
If you are a complete beginner, you should get a firm grasp of basic regex syntax just by reading the examples in the tables. I tried to …
Regular expression syntax cheat sheet - JavaScript | MDN
Mar 17, 2026 · This page provides an overall cheat sheet of all the capabilities of RegExp syntax by aggregating the content of the …
Python RegEx - W3Schools
A RegEx, or Regular Expression, is a sequence of characters that forms a search pattern. RegEx can be used to check if a string …
SimpleRegex - Free Online Regex Tester & Pattern Generator
Test and generate regular expressions in real-time. Free online regex tool for developers with syntax highlighting, pre-built examples, …
Regular expressions - JavaScript | MDN - MDN Web Docs
Mar 17, 2026 · This chapter describes JavaScript regular expressions. It provides a brief overview of each syntax element. For a …
Regular Expression Language - Quick Reference - .NET
Jun 18, 2022 · Each section in this quick reference lists a particular category of characters, operators, and constructs that you can …