JSON Formatter
Format, minify, and validate JSON text in your browser.
Regular expression tester
Test JavaScript regular expressions, inspect match positions and capture groups, and preview text replacements as you type.
Updates as you type or change an option
About this tool
Test JavaScript regular expressions, inspect match positions and capture groups, and preview text replacements as you type.
How to use
Enter a pattern without enclosing slashes, its flags and some test text. Use g for all matches, i to ignore case and m for multiline anchors. Replacements support JavaScript syntax such as $1 and $.
Expressions run in a separate worker and stop after 1.5 seconds. Limits are 100,000 text characters, 4,000 pattern characters and fewer than 2,000 matches. Narrow the input if results become too large.
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