Regex Replace Tool
Find text with a regular expression and replace matching content in your browser.
How to Use the Regex Replace Tool
Enter a regular expression, replacement text and source content to perform pattern-based find and replace. This is useful for cleaning logs, restructuring text, renaming repeated formats or extracting and rewriting consistent patterns.
Practical Example
A pattern that matches dates written as 2026-08-30 can be used with capture groups to rearrange them into 30/08/2026 across multiple lines.
Factors That Affect the Result
Regex flavor, flags, greedy versus lazy matching, capture groups, escaping and multiline input can significantly change results. Test patterns on sample text before applying them to important data.
Frequently Asked Questions
What are capture groups?
Parentheses can capture matched parts of a pattern so they can be reused in the replacement.
Can a regex replace multiple matches?
Yes, when global matching is enabled or the tool is designed to process all matches.
Why does my pattern match too much text?
Greedy quantifiers or missing boundaries are common causes; a Regex Tester can help debug the pattern.