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  1. 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.

  2. Regular expression - Wikipedia

    Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical …

  3. 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 …

  4. Regex Tutorial - How to write Regular Expressions?

    Apr 12, 2024 · A regular expression (regex) is a sequence of characters that define a search pattern. Here's how to write regular expressions: Start by understanding the special characters …

  5. Regex Cheat Sheet

    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 introduce features in a logical order and to keep out …

  6. Regular Expressions Quick Reference

    Oct 29, 2025 · This quick reference is a summary of all the regex syntax that is listed in the full reference tables, without any explanation. You can use this table if you’ve seen some syntax …

  7. 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 …

  8. What is Regex? A Beginner-Friendly Introduction – Regex Forge

    Mar 1, 2025 · If you’ve ever needed to find specific text in a large document, validate user input, or extract key information from messy data, you’ve probably encountered regular expressions …

  9. RegexOne - Lesson 1: An Introduction, and the ABCs

    Learn Regular Expressions with simple, interactive exercises. Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even …

  10. What is Regex? Quick Syntax & Cheat Sheet

    Aug 23, 2025 · What Is Regex? Regex (short for regular expression or regexp) is a compact language for describing text patterns. If you’ve ever needed to find, validate, or transform …