Regex & Cron Tester — Test Patterns and Cron Expressions
Test a regex against any string and validate 5-field cron expressions — with match details and errors explained.
A quick, reliable regex and cron tester for everyday development and DevOps. Paste a regex pattern and a test string to see matches, or validate a standard 5-field cron expression and get instant feedback. Free 5 tests per day per IP, no signup.
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Frequently asked questions
Is the regex tester free?
Yes — 5 free tests per day per IP, no signup. After the limit, continue via the DeFi Intel Agent Gateway API (pay-per-use) or a prepaid API key.
Which regex flavor is used?
The engine uses a standard JavaScript-compatible regex dialect. Advanced backreferences or look-behind may behave differently across engines.
What cron format is supported?
Standard 5-field cron (minute hour day-of-month month day-of-week), e.g. 0 9 * * 1 for 09:00 every Monday. 6-field variants with seconds are not supported.
What output do I get?
For regex: whether the pattern matched and match details. For cron: validity, a human-readable schedule description, or a clear error explaining the problem.
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