Useful
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Everything runs right here in your browser. What you paste never leaves this page — only DNS lookups go to Google Public DNS, Whois asks the domain or IP registry, My IP asks ipwho.is, and the calculator fetches exchange rates.

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EN · RU calculator

Regex tester

JavaScript regular expressions with live highlighting, every match and capture group (numbered and named), and a replace preview with $1 / $<name>. Runs in a separate thread, so a runaway pattern can't freeze the page.

Pattern Common

Test text Replace with (optional)