- Developer
Why your regex is slow: catastrophic backtracking explained
The reason `(a+)+b` hangs on `aaaaaaaaac` — and the five patterns that turn a 10ms validator into a 30-second ReDoS attack.
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Complete regex cheatsheet (with copy-paste patterns that actually work)
Every metacharacter, every flag, and 30 real-world patterns for email, IP, date, URL, slug, credit-card and more. All testable in the browser.
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