JSON Formatter
Format, validate and minify JSON, and see exactly which line has a mistake.
Regex Tester
Try a pattern against your text and see every match. Heavy patterns are stopped instead of freezing your tab.
Your files stay with you. Your files never leave your browser. This tool runs on your device: nothing is uploaded to our servers, so there is nothing for us to store or see.
How to use it
- Type your pattern (without slashes) and tick the flags you need.
- Paste or edit the test text.
- Read the highlighted matches and the groups table.
Questions people ask
Which regex flavour is this?
JavaScript (ECMAScript) regular expressions, as used in browsers and Node.js. Other flavours such as PCRE or Python differ slightly, for example in lookbehind and named group syntax.
Why does it say the pattern took too long?
Some patterns, like (a+)+$ , can take exponential time on certain text, known as catastrophic backtracking. The test runs in a background worker that is stopped after 1.5 seconds, so your page keeps working. Make the pattern more specific to fix it.
What do the flags mean?
g finds all matches, i ignores case, m makes ^ and $ match at each line, s lets the dot match new lines and u turns on full Unicode handling.
Is my text uploaded?
Your text is processed in your browser and never sent to our servers.
Want this inside your own account?
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