Find and Replace

Paste or type your text, enter a search term, and instantly replace all occurrences. Three modes are available: plain (default), case-sensitive, whole-word, and regular expression.

Options

Case sensitive: treats uppercase and lowercase as distinct.
Whole word: only matches the exact word, not substrings.
Regex mode: the find field is treated as a JavaScript regular expression. Capture groups work in the replacement (e.g., $1).

Regex mode guide

In regex mode, capture groups let you rearrange and transform text. Use parentheses to capture parts of the match and reference them in the replacement string:

Find: (\d4)-(\d2)-(\d2) — captures a date in YYYY-MM-DD format
Replace: $2/$3/$1 — reformats it as MM/DD/YYYY

Common regex patterns

Pattern	Matches	Example
`\d+`	One or more digits	42, 1000
`\s+`	One or more whitespace characters	spaces, tabs
`[A-Z]`	Any uppercase letter	A, B, Z
`^line`	"line" at the start of a line	line 1
`\bword\b`	Whole word boundary	"word" not "sword"
`(foo\|bar)`	Either "foo" or "bar"	foo, bar

Use cases

Bulk variable renaming: rename a variable throughout a code snippet without affecting partial matches.
Date format normalization: convert between ISO dates, US dates, and European dates using capture groups.
Whitespace cleanup: replace multiple spaces with a single space, or strip trailing spaces from each line.
Markdown cleanup: remove or replace specific formatting patterns across a long document.

Privacy

All processing is done locally in your browser. Your text is never sent to a server.