Find and Replace Tool — Batch Text Substitution with Regex Support

Find and replace is one of the most fundamental text operations — you probably use it daily in your editor. But when you need to do it on text outside of your editor (database exports, clipboard content, text you can't open in VS Code), having an online version is genuinely handy. The CalcHub Find and Replace Tool handles simple substitutions and full regex replacements with a live preview so you can see changes before committing.

How to Use It

1. Open CalcHub and navigate to Find and Replace.
2. Paste your text in the source box.
3. Enter the search term and replacement text.
4. Enable any options needed:

- Case insensitive: Matches "Hello", "hello", "HELLO" - Whole word only: Won't match "cat" inside "catfish" - Regex mode: Use regular expression patterns - Global replace: Replace all occurrences (not just first)

1. Preview appears live — click Apply to finalize.

Simple Examples

Find	Replace	Input	Output
"colour"	"color"	"favourite colour"	"favorite color"
", "	"\n"	"a, b, c, d"	a\nb\nc\nd
"Mr."	"Dr."	"Mr. Smith"	"Dr. Smith"
"\t"	", "	Tab-separated data	Comma-separated

Regex Examples

Regex mode unlocks powerful pattern matching:

Pattern	Replace	Effect
\d+	#	Replace all numbers with #
\s+		Collapse multiple spaces to one
^	-	Add bullet point to start of each line
\n		Convert newlines to HTML breaks
(https?://\S+)	$1	Wrap URLs in anchor tags
\b\w{10,}\b	[LONG]	Flag words over 9 characters

Multiple Replacements

The tool supports a "batch replace" mode where you define multiple find/replace pairs at once. Enter them one per line in the format find → replace. All substitutions apply sequentially to the text.

This is useful for things like:

• Replacing multiple UK spellings with US equivalents at once


• Converting multiple variable names from snake_case to camelCase


• Applying multiple formatting transformations to an export

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What's the difference between literal and regex mode?

Literal mode treats your search string exactly as typed — a period is a period, not "any character." Regex mode treats special characters (., *, +, ?, [, ], etc.) as pattern operators. If you're not using regex, stick to literal mode to avoid unexpected matches.

How do I use capture groups in replacements?

In regex mode, wrap parts of your pattern in parentheses to create capture groups. Reference them in the replacement with $1, $2, etc. For example, pattern (\w+) (\w+) with replacement $2 $1 swaps the first two words.

Can I undo a replacement?

The original text stays in the input box and the result appears in a separate output box — so you never destructively edit your source text. To try a different replacement, just modify the find/replace fields and the preview updates automatically.

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Related tools: Text Case Converter · Sort Lines Tool · Remove Duplicate Lines