Find & Replace All — mnewton

Regex find & replace across all text on any page. Capture-group substitutions, variables, and JavaScript-evaluated values, with undo.

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Find & replace ALL text on any webpage.

Full regex: capture groups, named groups, lookahead, i/m/s/u flags — or plain literal mode.
Substitutions: $1…$99, $& (whole match), $` / $' (around the match), $<name> (named group), $$.
Variables: use {{name}} in the replacement; define your own — values can be plain text or JavaScript.
Inline JS per match: {{= expr }} with match, g1…g9, groups, named, offset, i in scope.
Built-ins: {{date}} {{time}} {{datetime}} {{url}} {{host}} {{title}} {{rand}} {{i}} (match number).
Optional scopes: input fields & textareas, attributes (title, alt, placeholder, aria-label).
Count dry-run, multi-level undo, settings synced.

No background worker and no host permissions: it runs only on the tab you act on (activeTab).

Example — find (\d+) and replace with {{=Number(g1)*2}} doubles every number on the page.

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