txtnode Regex Tester
txtnode Regex Tester is a free browser tool for checking regular expressions against text.
What txtnode Regex Tester is
txtnode Regex Tester is a free browser tool for checking regular expressions against text. It highlights matches as you type and shows capture groups, while a replacement preview lets you inspect rewritten text before using it. Replacement strings can refer to captured text with $1 or $<name>. The tester uses JavaScript regular expressions as provided by the browser and offers global, ignore case, multiline, dot all, unicode, and sticky flags. If a pattern is incomplete, the browser's engine error is displayed while the previous result remains visible. The product page says the browser compiles and runs patterns locally, without transmitting or storing typed patterns or test data. The maker identifies validation rules, log filtering, bulk find and replace, and understanding inherited patterns as possible uses. It is available on the web at no cost, with no premium tiers or usage limits. Patterns written for Python, PHP, or Java may need adjustment to work with its JavaScript regex syntax.
Good
- Highlights matches as you type.
- Displays capture groups and replacement previews.
- Offers six regular-expression flags.
- Typed patterns and test data stay on the user's machine.
- Free with no premium tiers or usage limits.
Watch out
- Uses JavaScript regular-expression syntax only.
- Patterns from Python, PHP, or Java may need adjustment.
- Available on the web only.
Who it suits
It suits developers who want a quick browser utility for checking JavaScript regular expressions. It may also help people working on validation, log filtering, replacements, or inherited patterns.
Verdict
txtnode Regex Tester gives a clear way to inspect JavaScript regex matches, captures, and replacements in a browser. Account for syntax differences if bringing patterns from other languages.
Plans and prices
From txtnode Regex Tester's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | All tools free · no premium tiers, usage limits, or hidden fees |
The facts
Each one read from txtnode Regex Tester's own pages, with the date it was checked.
What it does
- Availability
- The maker says the tester is free and the tools have no premium tiers, usage limits, or hidden fees.checked 8 Oct 2026
- Flags
- The interface offers global, ignore case, multiline, dot all, unicode, and sticky flags.checked 8 Oct 2026
- Integrations
- The product page does not list integrations; it describes a browser based tool that runs locally.checked 8 Oct 2026
- Limit
- Patterns written for Python, PHP, or Java may need adjustment because the tester uses JavaScript regex syntax.checked 8 Oct 2026
- Pattern errors
- An incomplete pattern displays the engine error while preserving the existing result.checked 8 Oct 2026
- Privacy
- The product page says patterns and test data stay on the user's machine; the browser compiles and runs the pattern and does not transmit or store typed data.checked 8 Oct 2026
- Purpose
- A browser based tester that highlights regex matches as you type and shows capture groups.checked 8 Oct 2026
- Regex flavor
- The tester uses JavaScript regular expressions as implemented by the user's browser.checked 8 Oct 2026
- Replacement preview
- Replacement strings support $1 and $<name> references, with rewritten text previewed before use.checked 8 Oct 2026
- Support
- Messages go directly to the maker by email, with no ticket system or chatbot.checked 8 Oct 2026
- Use cases
- The maker describes validation rules, log filtering, bulk find and replace, and understanding inherited patterns as use cases.checked 8 Oct 2026
- Who it's for
- The maker says txtnode's developer tools are for developers who want fast browser utilities, alongside writers and people who prefer simple tools.checked 8 Oct 2026
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