DEVELOPER & SECURITY

Regex Tester

Test JavaScript regular expressions against text.

✓ No account↯ Mobile ready

QUICK ANSWER

What is Regex Tester?

Regex Tester is a browser-based utility designed to test JavaScript regular expressions against text.

Search intent: Complete the “regex tester” task with a lookup value and verify a readable lookup result.
Input: a lookup value
Output: a readable lookup result
Common tasks: regex tester · match

Ready to start

Your input stays in this tab

PatternFlags

Test text

Run the expression in a time-limited local Worker.

HOW IT WORKS

Provide a lookup valueTest JavaScript regular expressions against text. WhaleTu checks the input before processing where the format allows it.
Run regex testerChoose the options shown for Regex Tester, then process the task in this browser tab.
Verify a readable lookup resultReview the result and disclosed limits before copying or downloading it.

COMMON QUESTIONS

What does Regex Tester do?＋

Test JavaScript regular expressions against text. The expected result is a readable lookup result.

What input does Regex Tester accept?＋

Use a lookup value. The page validates supported formats and explains known limits before or during processing.

Does Regex Tester upload my data?＋

No. Processing happens inside this browser tab and input content is not included in WhaleTu analytics.

Is Regex Tester free to use?＋

Yes. No account is required.

CAPABILITYregex

PROCESSINGlocal limits

INDEX STATUSCanonical tool page

LIMITSStandard browser limits