Free Online Regex Replace Tool
Quick Tips
- • This tool runs entirely in your browser - your data stays private.
- • Press Ctrl+V (Cmd+V on Mac) to quickly paste text.
- • Use the Copy button to save your result to clipboard.
- • Bookmark this page for quick access!
Replace text using regular expression patterns.
Your Recent Tools
Examples
Pattern: (\d{2})/(\d{2})/(\d{4})
Replace: $3-$1-$2
Text: 12/25/2024
2024-12-25
Pattern: (\w+), (\w+) Replace: $2 $1 Text: Smith, John
John Smith
Pattern: <[^>]+> Replace: (empty) Text: <b>Hello</b>
Hello
Pattern: (\w+)@(\w+\.\w+) Replace: [$1 at $2] Text: user@domain.com
[user at domain.com]
Why Use This Tool?
What problems does this solve?
Complex text transformations require pattern-based replacement that simple find-replace cannot handle. Regex replace enables sophisticated text manipulation.
Common use cases:
- Reformatting dates, phone numbers, and structured data
- Cleaning up inconsistent formatting across documents
- Extracting and reorganizing text patterns
Who benefits from this tool?
Developers transforming data formats. Editors making bulk text corrections. Data analysts cleaning datasets. Anyone needing powerful text transformation.
Privacy first: All processing happens in your browser. Your data never leaves your device.
Frequently Asked Questions
Backreferences let you include captured groups from your match in the replacement. Use parentheses in your pattern to capture portions of the match, then reference them as $1, $2, $3, etc. in the replacement string.
Wrap the portion you want to capture in parentheses. For example, (\d+)-(\d+) captures two number sequences. The first is $1 and the second is $2 in your replacement.
Yes, you can use backreferences in any order. If your pattern captures (First) (Last), your replacement can be $2, $1 to output Last, First. This is perfect for reformatting data.
Use $$ to insert a literal dollar sign in your replacement text. Since $ is used for backreferences, you need to escape it when you want the actual character.
If a capture group is optional and does not match for a particular occurrence, the backreference typically produces an empty string. Design your patterns to handle optional captures appropriately.
Yes, the tool uses JavaScript regular expression syntax and behavior, making it ideal for web developers testing patterns they will use in their code.
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