Regex for beginners: the only 10 patterns you need

The core syntax

• . any character
• * 0 or more
• + 1 or more
• ? optional
• \d digit, \w word char, \s whitespace
• [abc] character class
• ^ start, $ end
• (...) capture group

10 most-used patterns

1. Email: [\w.-]+@[\w.-]+\.\w+
2. Phone (Indian): (?:\+91|0)?[6-9]\d{9}
3. Date YYYY-MM-DD: \d{4}-\d{2}-\d{2}
4. URL: https?://[^\s]+
5. PAN: [A-Z]{5}\d{4}[A-Z]
6. GSTIN: \d{2}[A-Z]{5}\d{4}[A-Z][A-Z\d]Z[A-Z\d]
7. IPv4: \d{1,3}(?:\.\d{1,3}){3}
8. Hex color: #[0-9a-fA-F]{6}
9. Whitespace cleanup: \s+
10. Trim: ^\s+|\s+$

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