Regex Cheat Sheet - Free Online IT Tool

🧩 Regex Cheat Sheet

A quick reference guide for common Regular Expression (Regex) syntax and patterns.

ℹ️ About Regex Cheat Sheet

Regular Expressions (Regex) are a powerful language for pattern matching and text manipulation, used across almost all programming languages and command-line tools like grep, sed, and awk. However, the syntax can be dense and difficult to remember.

Our Regex Cheat Sheet provides a fast, categorized reference for the most common tokens, quantifiers, and anchors. Whether you are building a validation script, searching through server logs, or refactoring code, this guide ensures you have the right syntax for your search patterns.

📖 How to use Regex Cheat Sheet

1. Browse the categories: Characters, Quantifiers, Anchors, and Groups.
2. Click 'Run Tool' to view the full reference table.
3. Use the tokens shown to build complex search and replace patterns in your favorite tools.

❓ Frequently Asked Questions

What is a 'word boundary' (\b)?

A word boundary matches the position between a word character and a non-word character (or the start/end of a string). It's used to find whole words only.

What is the difference between * and +?

The asterisk <code>*</code> matches the preceding element zero or more times, while the plus <code>+</code> requires at least one occurrence.

How do I escape a special character?

To match a character that has a special meaning in Regex (like a dot or a question mark), prefix it with a backslash: <code>\.</code> or <code>\?</code>.