Find and Replace
Find and replace text with optional regex support.
Find and Replace scans your text for a search term or regular expression and swaps every match with a replacement string, showing exactly how many replacements were made. It supports optional regex mode and case-insensitive matching, all computed locally in your browser.
How it works
Enter a Find value and a Replacement value. By default the Find value is matched literally; enabling 'Use regex' interprets it as a JavaScript regular expression, letting you use capture groups like $1 in the replacement. Case-insensitive matching ignores letter case in both modes.
Benefits
- Live replacement count so you know how many matches were changed
- Optional regex mode with capture group support in the replacement
- Optional case-insensitive matching for literal or regex search
- Runs fully offline with instant feedback
Use cases
- Renaming a variable, product name, or placeholder across a document
- Normalizing inconsistent spacing or punctuation with a regex pattern
- Stripping or replacing specific tokens in exported data
- Cleaning up copy-pasted text before publishing
Best practices
- Test your regex pattern on a small sample before running it on large text
- Use capture groups ($1, $2) to preserve parts of the matched text in the replacement
- Enable case-insensitive matching when the exact casing of your target text varies
- Check the replacement count to confirm the pattern matched as many times as expected
Common mistakes
- Forgetting to enable regex mode when using special characters like '.' or '*' as patterns
- Leaving regex special characters unescaped when literal matching was intended
- Assuming an empty Find field will do something—no replacements happen on empty input
- Not checking the match count, which can reveal unexpectedly broad or narrow matches
Privacy
All matching and replacement runs locally using your browser's JavaScript engine. ToolHub does not receive or store the text you process here.
Frequently asked questions
- How do I use regular expressions in Find and Replace?
- Enable the 'Use regex' option, then enter a JavaScript-flavored regular expression pattern in the Find field. Capture groups can be referenced in the replacement using $1, $2, and so on.
- What happens if I do not enable regex mode?
- Without regex mode, the Find field is treated as a literal string. Special regex characters like '.', '*', or '(' are matched exactly rather than interpreted as pattern syntax.
- How is the replacement count calculated?
- The tool counts every match of the Find pattern across the entire text before replacing, and displays that total so you know exactly how many replacements were made.
- What does case-insensitive matching change?
- When enabled, uppercase and lowercase letters in the Find pattern match regardless of the casing used in your text.
- What happens if my regex pattern is invalid?
- The tool shows an error message describing the regular expression problem instead of crashing, so you can fix the pattern and try again.
- Is my text uploaded when I use this tool?
- No. Find and replace runs entirely in your browser using JavaScript's string and regular expression engine, with no server involved.
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