txtnode Regex Tester

What txtnode Regex Tester is

txtnode Regex Tester is a free web tool for writing and checking regular expressions in a browser. It marks matches as you type, displays capture groups, and lets you preview replacement text before using it. Replacement strings can refer to captures with $1 or $<name>. The tester runs JavaScript regular expressions as implemented by the browser, with global, ignore case, multiline, dot all, unicode, and sticky flags available. If a pattern is incomplete, the browser’s error appears while the prior result remains visible.

The product page says patterns and test data stay on your machine: the browser compiles and runs them without transmitting or storing the text you enter. The maker describes validation rules, log filtering, bulk find and replace, and understanding inherited patterns as uses. It is aimed at developers looking for quick browser utilities, as well as writers and people who prefer simple tools. It is free, with no premium tiers, usage limits, or hidden fees. Patterns written for Python, PHP, or Java may need adjustment to work with JavaScript regex syntax.

Who it suits

It suits developers who want a browser-based utility for inspecting patterns, capture groups, and replacements. Writers and people who prefer simple tools may also find it useful for validation rules, log filtering, or bulk find and replace.

Getting started

1. Open https://txtnode.com/regex-tester in a web browser.
2. Enter a regular expression and test text to view matches and capture groups.
3. Choose available flags to adjust how the JavaScript pattern is evaluated.
4. Enter a replacement string to preview rewritten text.

Verdict

Choose txtnode Regex Tester if you want a free browser utility for checking JavaScript regular expressions, capture groups, and replacement output. Look elsewhere if your patterns rely on Python, PHP, or Java syntax and you do not want to adapt them.