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Regex Tester & Debugger
Write and validate regular expressions against test subjects with live highlight overlays client-side.
Free Forever
🔒 Private & Local
⚙️ Regex Tester & Debugger
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How to Use Regex Tester
1
Define Pattern
Type in your regular expression rules (excluding surrounding slashes).
2
Set Flags
Input flags like 'g' or 'i' to refine matching scopes.
3
Add Subject
Input text paragraphs to view matching highlights and group indexes instantly.
Frequently Asked Questions
This regex tester uses the standard JavaScript regex engine (ECMAScript) natively supported by your web browser.
Common flags include 'g' (global match to find all occurrences), 'i' (ignore case sensitivity), and 'm' (multiline mode).