What Is Find and Replace?

Find and replace (sometimes called search and replace) scans a body of text for every occurrence of a target string and substitutes it with a replacement string. It is available in virtually every text editor, code editor, word processor, and spreadsheet application. The basic version is straightforward: type what to find, type the replacement, and click Replace All.

More advanced implementations support regular expressions (patterns instead of literal strings), case-sensitive matching, whole-word matching, and capture groups that let you reuse parts of the found text in the replacement.

Keyboard Shortcuts for Find & Replace

Platform	Find	Find & Replace
Windows / Linux	Ctrl+F	Ctrl+H
macOS	Cmd+F	Cmd+Option+F
VS Code	Ctrl+F	Ctrl+H (file) / Ctrl+Shift+H (project)
Google Docs	Ctrl+F	Ctrl+H
Microsoft Word	Ctrl+F	Ctrl+H

Case-Sensitive vs Case-Insensitive Matching

By default, many find-and-replace tools are case-insensitive — searching for "apple" also matches "Apple" and "APPLE". When you need precision — for example, replacing a variable name without touching a class name of the same letters in different case — enable case-sensitive mode. The ToolsBox Find & Replace tool includes a toggle for this.

Whole-Word Matching

Whole-word matching ensures the search string is surrounded by non-word characters (spaces, punctuation, line breaks). If you search for cat with whole-word on, it will match cat in a sentence but not cats, concatenate, or scatter. This prevents accidental partial-word replacements when renaming identifiers in code.

Using Regular Expressions in Find & Replace

Regular expressions (regex) transform find-and-replace from a simple text swap into a powerful transformation engine. Here are practical examples:

Pattern	Replacement	What It Does
\b(\w+)\s+\1\b	$1	Remove duplicate consecutive words
(\d{4})-(\d{2})-(\d{2})	$3/$2/$1	Reformat date YYYY-MM-DD → DD/MM/YYYY
https?://\S+	[link]	Replace all URLs with placeholder
^\s+	(empty)	Remove leading whitespace from each line

Use our Regex Tester to test your patterns before running a bulk replacement.

Practical Use Cases

• Rename a variable across a codebase — change userID to userId everywhere with whole-word and case-sensitive on.
• Fix repeated typos — replace all instances of "teh" with "the" in a long document.
• Reformat data — change date formats, phone number styles, or address formats using regex capture groups.
• Strip HTML tags — use the pattern <[^>]+> to remove all HTML tags from pasted content.
• Normalise whitespace — replace multiple spaces with a single space using [ ]{2,}.

Frequently Asked Questions

What is find and replace?

Find and replace scans text for a target string and substitutes it with a replacement. It supports options like case sensitivity, whole-word matching, and regular expressions for complex pattern-based replacements.

What does 'match whole word' mean?

Whole-word matching requires the search term to appear as a complete word surrounded by non-word characters. Searching for 'cat' with whole-word enabled finds 'cat' but not 'cats', 'concatenate' or 'scatter'.

Can I use regex in find and replace?

Yes. Enable regex mode to use patterns like \d+ for digits or capture groups with parentheses. This lets you reformat dates, extract structured data, or make complex substitutions that simple text matching cannot handle.

How do I replace all occurrences at once?

Click Replace All in the tool, or use Ctrl+H (Windows) / Cmd+Option+F (Mac) in your editor. The ToolsBox Find & Replace tool replaces every matching instance in one click.