계약 기반 이메일 검증 프롬프트

from typing import List, Tuple def validate_emails(emails: List[str]) -> List[Tuple[str, bool]]: """ Validate emails without regex for high throughput. Returns list of (email, is_valid) tuples. """ results = [] for email in emails: valid = True try: if not email or len(email) > 254: valid = False else: # Split local and domain parts = email.split('@') if len(parts) != 2: valid = False else: local, domain = parts # Local part checks if not local or len(local) > 64: valid = False elif local[0] == '.' or local[-1] == '.': valid = False elif '..' in local: valid = False elif any(ord(c) < 33 or ord(c) > 126 for c in local): valid = False elif any(c in '(),:;<>@[\\]' for c in local): valid = False # Domain checks if valid: if not domain or len(domain) > 255: valid = False elif domain[0] == '.' or domain[-1] == '.': valid = False elif '..' in domain: valid = False else: # Validate domain characters and dot placement prev_dot = False for c in domain: if c == '.': if prev_dot: valid = False break prev_dot = True elif c.isalnum() or c == '-': prev_dot = False else: valid = False break else: if not domain.replace('.', ''): valid = False elif len(domain) < 3: # must have TLD valid = False elif '-' in domain.split('.')[-1][0]: valid = False except: valid = False results.append((email, valid)) return results # Test cases assert validate_emails(['user@example.com'])[0][1] == True assert validate_emails(['bad@@example.com'])[0][1] == False assert validate_emails(['user@corp-domain.com'])[0][1] == True assert validate_emails(['user..name@example.com'])[0][1] == False assert validate_emails(['u@x.co'])[0][1] == True