Regex Cheat Sheet

• Free online regex cheat sheet — works right in your browser, no installation needed
• Syntax organized into nine categories: character classes, character sets, anchors, quantifiers, groups & backreferences, lookaround assertions, flags, escaping, and common examples, with keyword search to quickly find what you need
• One-click regex copying, live match testing, and ready-to-use examples for email, URL, IP, date, and more — ideal for everyday development reference

1. Open the tool page — no download or installation required
2. Type a regex syntax or use-case keyword (e.g., email, digit, anchor) in the search box, or click a category button to filter
3. Click the copy icon on a card to copy the regex, or click the Test icon to open the tester
4. In the tester, adjust the pattern and flags (g/i/m/s/u/y), enter a test string, and see matches update in real time; use Copy to grab the full /pattern/flags

• This tool is completely free and requires no registration or login
• Everything runs locally in your browser — your data is never uploaded
• Regex syntax support varies slightly across languages and engines (e.g., JavaScript vs PCRE); verify against your target environment before use

Free online regex cheat sheet. Browse common regular expression syntax by character classes, anchors, quantifiers, groups, lookaround assertions, flags, escaping and practical examples. Supports search, one-click copy and live testing.

Open the tool page — no download or installation required Type a regex syntax or use-case keyword (e.g., email, digit, anchor) in the search box, or click a category button to filter Click the copy icon on a card to copy the regex, or click the Test icon to open the tester In the tester, adjust the pattern and flags (g/i/m/s/u/y), enter a test string, and see matches update in real time; use Copy to grab the full /pattern/flags

This tool is completely free and requires no registration or login Everything runs locally in your browser — your data is never uploaded Regex syntax support varies slightly across languages and engines (e.g., JavaScript vs PCRE); verify against your target environment before use

Yes, Regex Cheat Sheet is completely free. No download or installation required — it runs right in your browser.