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Strings & text

Format, split, join, parse, and clean text — everyday Python string patterns.

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Strings & text easy

How to Detect PII in Documents Using Python

Use regex patterns to automatically detect emails, phone numbers, SSNs, and credit card numbers in text documents.

pii regex data-privacy
Python 
import re
from typing import List, Dict

def detect_pii(text: str) -> Dict[str, List[str]]:
    patterns = {
        "email": r"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}",
        "phone": r"\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}",
        "ssn": r"\b\d{3}-\d{2}-\d{4}\b",
        "credit_card": r"\b\d{4}[- ]?\d{4}[-…
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