Generate and Test Regex and Cron Expressions from Plain Language
Regular expressions (Regex) and scheduled job definitions (Cron expressions) are among the most used areas of modern software engineering, and, because of their complex syntax, among the biggest time sinks. AI Regex & Cron Generator turns complex validation rules and scheduling requirements described in plain language into error-free expressions in seconds.
You can test the generated regular expressions instantly with the live match simulator, see the effect of the flags (g, i, m), and integrate with Linux, GitHub Actions and Vercel Cron Jobs smoothly using the standard 5-field crontab syntax.
1. Regex and Cron Use Cases
Data Validation and Text Parsing
Complex password criteria in sign-up forms (at least 1 uppercase letter, 1 digit, 1 special character), Turkish national ID and IBAN validation, and extracting IP addresses and HTTP status codes from Nginx access logs.
Periodic Jobs and Automation
Backing up PostgreSQL every night at 03:00, sending a weekly newsletter every Monday at 09:00, and running an API sync every 15 minutes with a Vercel Serverless Function.
2. Common Crontab and Regex Expression Reference
| Type | Syntax / Expression | Meaning & Run Time |
|---|---|---|
| Cron | */15 * * * * | Run every 15 minutes |
| Cron | 0 9 * * 1-5 | Every weekday at 09:00 |
| Cron | 0 0 1 * * | At midnight (00:00) on the 1st of every month |
| Regex | ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ | Standard email address validation |
| Regex | ^TR[0-9]{2}\s?([0-9]{4}\s?){5}[0-9]{2}$ | Turkish IBAN number pattern |
3. Performance and Security: ReDoS and Cron Overlaps
- •Catastrophic Backtracking (ReDoS) Protection: Nested ambiguous quantifiers (
(a+)+$) can push servers to 100% CPU and open the door to DoS attacks. Our AI engine produces atomic grouping and safe PCRE rules. - •UTC / Timezone Awareness: Linux servers and Vercel Cron Jobs run in the UTC time zone by default. Remember to shift jobs scheduled in your local time by your UTC offset (for Turkey, UTC+3, that means 3 hours back).
- •Preventing Job Overlap: When long-running cron jobs (e.g. data processing that takes over 10 minutes) are triggered at short intervals (e.g. every 5 minutes), use a locking mechanism (a Redis mutex or a DB lock).