What can I do with regex mode?

Match patterns rather than fixed strings — every number, every email address, text between two markers — and reuse captured groups in the replacement, so you can reformat rather than just substitute.

Nothing matched. Why?

Check case sensitivity first, then invisible characters. Text copied from a PDF often carries non-breaking spaces that look identical to ordinary ones but are a different character.

What can I do with regular expressions?

Match patterns rather than fixed text, and reuse parts of the match in the replacement with $1 and $2 — renumbering invoices or reformatting dates in one pass.

Is there a limit on how much text?

Plain replacement handles very large text. Regex mode is capped at 200,000 characters, because a badly formed pattern on a huge input can hang the tab.

Find & Replace

Plain text or regex, with a live match count and capture groups in the replacement.

Runs in your browser — nothing uploaded

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How to use Find & Replace

Paste your text.
Enter what to find and what to replace it with. Switch on regex for patterns.
Check the live match count, then apply.

Questions

What can I do with regex mode?: Match patterns rather than fixed strings — every number, every email address, text between two markers — and reuse captured groups in the replacement, so you can reformat rather than just substitute.
Nothing matched. Why?: Check case sensitivity first, then invisible characters. Text copied from a PDF often carries non-breaking spaces that look identical to ordinary ones but are a different character.
What can I do with regular expressions?: Match patterns rather than fixed text, and reuse parts of the match in the replacement with $1 and $2 — renumbering invoices or reformatting dates in one pass.
Is there a limit on how much text?: Plain replacement handles very large text. Regex mode is capped at 200,000 characters, because a badly formed pattern on a huge input can hang the tab.