Regex Playground - Free Online Regex Tester & Explainer

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Pattern Explanation

Cheat Sheet

.Any character

\d \w \sDigit, word, whitespace

\D \W \SNOT digit, word, whitespace

[abc]Any of a, b, or c

[^abc]NOT a, b, or c

[a-z]Range a to z

^ $Start / end of string

\bWord boundary

* + ?0+, 1+, 0 or 1

{n} {n,m}Exactly n, between n-m

(abc)Capture group

(?:abc)Non-capturing group

a|ba OR b

(?=a)Lookahead

(?<=a)Lookbehind

Common Patterns

URL

IPv4

US Phone

US Zip

Hex Color

Date YYYY-MM-DD

IP Strict

Strong Password

HTML Tag

Full Name

Price USD

Free Online Regex Tester

Regex Playground is a free, fast, and privacy-friendly regular expression tester. Type your pattern and test string — matches are highlighted instantly. No data is sent to any server; everything runs in your browser.

What is Regex?

Regular expressions (regex) are patterns used to match character combinations in strings. They're used in every programming language for search, validation, and text manipulation. Our regex tester supports JavaScript regex syntax including lookaheads, lookbehinds, named capture groups, and all standard quantifiers.

Features

Real-time match highlighting as you type
Pattern explainer — understand what each part of your regex does
Common patterns library with one-click loading
Capture group visualization
Cheat sheet for quick reference
No account required, no data stored

How to Use This Regex Tester

1. Enter your regular expression pattern in the top input field. 2. Set flags (g for global, i for case-insensitive, m for multiline, s for dotAll). 3. Type or paste your test string. 4. Matches appear instantly below. Click any common pattern to load it instantly.