Find and Replace

How it works

Every search, plain or regex, is compiled into a single JavaScript RegExp under the hood. In plain-text mode your search term is escaped first (so ., (, $ and friends match literally), "whole word" wraps the pattern in \b word boundaries, and the case toggle simply adds or removes the i flag. The result re-renders on every keystroke, and the match count comes from running the same pattern with the global flag before replacing. Invalid regex input doesn't wipe your text, it just shows the engine's error and leaves the output untouched.

Here's the feature most find-and-replace pages never mention: because replacement uses JavaScript's native String.replace, backreferences work in regex mode. Use $1, $2 for capture groups and $& for the whole match. So finding (\w+), (\w+) and replacing with $2 $1 flips "Doe, Jane" into "Jane Doe" across an entire file, and $$ gives you a literal dollar sign when you need one.

The whole thing runs in this page's JavaScript on your machine. Open DevTools' Network tab while you work: no request carries your text, which is exactly why it's safe to paste logs, config files, or anything else you'd rather not upload to a random website.