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AI & LLM integration patterns

Call LLM APIs, structure prompts, parse responses, and ship AI features safely.

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How to Redact Emails and Phones Before Sending to an LLM in Python

This code uses regular expressions to replace email addresses and US phone numbers with [EMAIL] and [PHONE] placeholders before any LLM processing.

pii redaction regular-expressions
Python 
import re

def redact_pii(text: str) -> str:
    # Replace email addresses with [EMAIL]
    text = re.sub(r'[\w.+-]+@[\w-]+\.[\w.-]+', '[EMAIL]', text)
    # Replace phone numbers (US format) with [PHONE]
    text = re.sub(r'\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}', '[PHONE]', text)
    return text

if __name__ == "__main…
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