Text Diff Checker
Compare two texts online and see added and removed lines highlighted. Free diff checker that runs 100% in your browser.
Regex Tester
Enter a pattern and test text below. Matches are highlighted live as you type, with capture groups listed for each match. Uses your browser's native JavaScript regex engine.
Private by default: processing stays on your device
Matches
Capture groups
Example: extract years
Input
Pattern: \b(19|20)\d{2}\b
Text: Born 1991, graduated 2013. Output
2 matches: 1991, 2013
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Frequently asked questions
Which regex flavor does this use?
JavaScript (ECMAScript), the same engine your browser runs. Most patterns behave like PCRE, but lookbehind and some Unicode features vary by flavor.
What do the flags mean?
g finds all matches instead of the first, i ignores case, m makes ^ and $ match line starts/ends, s lets . match newlines, u enables full Unicode mode.
Why does my pattern show an error?
The pattern isn't valid JavaScript regex syntax. The exact engine error is shown so you can fix it. Remember to escape special characters like . ( ) [ ] with a backslash.
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