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Regex tester
Match or replace with a timed, isolated JavaScript regex worker.
Text, JavaScript regular expression
JSON, UTF-8 text
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter input text, a JavaScript regex pattern without surrounding slashes, and its flags.
- Choose Find matches or Replace matches; for replacement, enter literal replacement text.
- Run the tool to review or download JSON matches or the replaced text.
Examples
Pattern \b\w+\b with g matches words.
Limitations
At most 200,000 input characters and 1,000 matches.
750 ms worker limit; browser regex syntax is used.
Replacement is literal; no capture expansion.
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