Regex Tester
Test regular expressions against a string with live match highlighting. View match positions, groups, and copy all matches.
Regular Expression Tester
Regular expression flags
g (global) finds all matches. i makes matching case-insensitive. m makes ^ and $ match line boundaries. s (dotall) makes . match newlines.
Why use Regex Tester online?
Regex Tester in the browser saves context switching: no CLI install, no fragile one-liners, and instant feedback for teammates who do not live in the terminal. It is ideal for debugging, demos, and quick checks during code review.
Tips for best results
Work with a sample payload first, then paste production data. Keep privacy in mind: prefer local browser processing for secrets, tokens, and customer data. Bookmark this page for faster access next time.
How to use
- Enter a regular expression pattern (without the surrounding slashes).
- Toggle flags as needed.
- Paste your test string.
- Matches are highlighted in real time. Copy all matches with the Copy button.
- Review the output and use Copy to paste into your editor, ticket, or chat.
- Need another utility? Scroll to Related Tools below for Regex Tester companions on skybin.io.
- For a deeper walkthrough, read the linked Skybin blog article at the bottom of this page.
Online tool vs terminal
| Terminal / CLI | This tool |
|---|---|
| Install CLI tools or write a one-off script | Open the tool in your browser — no install |
| Look up flags in man pages or Stack Overflow | Paste input or upload files where supported |
| Repeat for each file format or edge case | Get instant visual feedback and copy buttons |
All matching runs in your browser — nothing is sent to any server.
Frequently Asked Questions
- What regex flavour is used?
- JavaScript's built-in RegExp engine (ECMAScript regex).
- Can I test multi-line patterns?
- Yes. Enable the m flag to make ^ and $ match at line boundaries, and s to make . match newlines.
- Is this tool free to use?
- Yes. All Skybin developer tools are free with no account, API key, or usage limits.
- Does my data get sent to a server?
- No. Processing runs in your browser whenever possible. Sensitive input never leaves your device unless a tool explicitly fetches a URL you provide (e.g. OG Validator).
- Can I use this on mobile?
- Yes. The tools work in modern mobile browsers, though a desktop screen is easier for large JSON or PDF workflows.
- How is this different from desktop apps?
- There is nothing to install or update. Open a bookmarked URL and start working — ideal for quick tasks during development or support calls.
- Are there keyboard shortcuts?
- Most tools support standard paste (Ctrl+V / Cmd+V) and select-all in text areas. Copy buttons provide one-click output.
- Does Skybin store my history?
- No. We do not log tool inputs or outputs. Refreshing the page clears in-memory state unless the tool encodes state in the URL.