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// Email (simple, practical) /^[^\s@]+@[^\s@]+\.[^\s@]+$/ // URL /^https?:\/\/[\w\-]+(\.[\w\-]+)+([\w\-._~:/?#[\]@!$&'()*+,;=]*)?$/ // Phone (US) /^\(?(\d{3})\)?[-.\s]?(\d{3})[-.\s]?(\d{4})$/ // Strong password (8+ chars, upper, lower, digit, special) /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&]).{8,}$/ // Hex color /^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/ // IPv4 /^(\d{1,3}\.){3}\d{1,3}$/
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