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Regex Tester
Try JavaScript regular expressions against sample text. See matches, capture groups and common flags (g, i, m, s, u).
Processed locally in your browser. Your input is not uploaded.
4 matches
| # | Match | Index | Groups |
|---|---|---|---|
| 1 | Ada | 0 | — |
| 2 | Lovelace | 4 | — |
| 3 | Linus | 17 | — |
| 4 | Torvalds | 23 | — |
How to use this tool
Paste or type your input, adjust the options, then copy or download the result.
JavaScript regex tester with capture groups
Regular expressions fail loudly in Laravel validation, Nginx maps and form frontends. A live tester with flags and groups is faster than deploying to see a mismatch.
Enter a pattern, toggle g, i, m, s or u, and watch matches and capture groups update. Invalid patterns show the engine error instead of hanging the page.
JavaScript regex is not PCRE. If you copy a pattern into PHP, test it again with preg_match. Possessive quantifiers and some lookbehinds differ.
If you searched for regex tester, regular expression tester, regexp test online, regex capture groups, this free online Regex Tester is the page you want. Test regular expressions with live matches. It lives at https://blog.webeface.de/tools/regex-tester next to the IT – Software Development blog, so you can jump from a Laravel tutorial into a working utility without opening another SaaS.
Regex Tester is built for everyday text, encoding and debugging. Try JavaScript regular expressions against sample text. See matches, capture groups and common flags (g, i, m, s, u). Because processing is local, you can paste staging tokens, draft SQL or unpublished copy without sending it to an unknown formatter.
People also look this tool up as javascript regex. Those queries all describe the same job: test regular expressions with live matches. Bookmark the English URL; German lives under /de.
On a German keyboard you may have typed Regex Tester, Reguläre Ausdrücke testen, Regex prüfen, Regex Gruppen. The Regex Tester still solves that request. Webeface targets DACH developers who read English tool names but search in German.
A typical workflow is: open Regex Tester, paste the sample, copy the result, then continue in Laravel Validation Helper, SQL Formatter, JSON Validator. Keeping the utilities on one origin (blog.webeface.de/tools) means one privacy policy and one brand you already know from the blog.
There is no paywall, watermark or daily quota on the Regex Tester. If a search result promised “regex tester online free”, this page is that result: fast, private and meant to be used every day.
Step-by-step
- Open the free Regex Tester at https://blog.webeface.de/tools/regex-tester.
- Paste or type your input. Nothing is stored as a document on our servers for this editor.
- Adjust options (format, dialect, flags, stack) until the preview matches what you need.
- Copy or download the result into Laravel, Nuxt, Nginx, Docker or your editor.
- Follow related tools (Laravel Validation Helper, SQL Formatter, JSON Validator) if the next step is a conversion or check.
When to use this tool
- Draft a Laravel regex validation rule.
- Extract IDs from log lines.
- Check case-insensitive German slugs.
- Search Google for “regex tester” when you are away from your editor.
- Share Regex Tester with a teammate instead of pasting secrets into a random website.
Search terms for this page
People find Regex Tester with these queries:
- regex tester
- regular expression tester
- regexp test online
- regex capture groups
- javascript regex
Frequently asked questions
Is this PCRE?
No. It is the JavaScript RegExp engine. Re-test in PHP if that is your runtime.
Can it detect ReDoS?
It does not analyse backtracking risk. Keep patterns simple on untrusted input.
Is the Regex Tester free to use?
Yes. The Regex Tester on Webeface Tools is free, has no signup and no usage limit.
Do I need an account to use the Regex Tester?
No account is required. Open the page and start immediately.
Is my data uploaded when I use the Regex Tester?
No. The Regex Tester runs in your browser. Input stays on this device.
How do I find this Regex Tester again?
Bookmark https://blog.webeface.de/tools/regex-tester or search for regex tester on Google together with “webeface”.
Does the Regex Tester work on mobile?
Yes. The layout works on phones and desktops. Large pastes are easier on a computer.