Regular expression tester
Test JavaScript regular expressions against your text with live highlighting, see every match with its capture groups and preview replacements.
g: global, find all matches · i: ignore case · m: multiline, ^ and $ match at line breaks · s: dot matches line breaks · u: Unicode · y: sticky
Enter a pattern and some text to see the matches highlighted here.
Replace
How it works
- 1
Paste or type your input
Paste text or code, type a value or open a file. Where a sample is offered, it shows how the tool works.
- 2
Pick the options
The result updates as you type. Switch modes or change the options to get exactly the output you need.
- 3
Copy or download
Copy the result to the clipboard with one click or download it as a file.
Why PixNudge
Nothing leaves your browser
Passwords, API keys, tokens, SQL queries and customer data are processed on your device and never sent to a server.
Instant results
There is no upload and no waiting: results appear while you type, even for large inputs.
Free, no sign-up
No account, no limits and no ads inside the tools. Bookmark the page and use it whenever you need it.
Frequently asked questions
Which regex flavor does this tester use?
It uses your browser's JavaScript (ECMAScript) engine, including named groups (?<name>…), lookbehind and Unicode property escapes (\p and \P). Most patterns also work the same way in Python, Java, PHP and .NET, but details can differ.
What happens if my pattern is too slow?
Patterns run in a background worker. If one takes longer than two seconds, for example because of catastrophic backtracking like (a+)+$, it is stopped and the page stays responsive.
How do I use capture groups in the replacement?
Write $1, $2 and so on for numbered groups, $<name> for named groups and $& for the whole match. To insert a literal dollar sign, write $$.