import re
pattern = r'^(?!admin)\w+$'
print(re.match(pattern, "user123"))  # 匹配成功
print(re.match(pattern, "adminUser"))  # 匹配失敗

pattern = r'(?<!\$)\d+'
print(re.search(pattern, "123"))  # 匹配123
print(re.search(pattern, "$456"))  # 匹配失敗

import re

def validate_password(username, password):
    # 排除用戶名
    if re.search(rf'(?i){username}', password):
        return "密碼不能包含用戶名"
    # 復(fù)雜度校驗
    rules = [
        (r'.{8,}', "至少8位"),
        (r'[a-z]', "包含小寫字母"),
        (r'[A-Z]', "包含大寫字母"),
        (r'\d', "包含數(shù)字"),
        (r'[!@#$%^&*]', "包含特殊字符")
    ]
    failed_rules = [msg for pat, msg in rules if not re.search(pat, password)]
    return failed_rules or "密碼有效"

log = """INFO: Operation started
ERROR: Disk full
DEBUG: Debugging complete"""
filtered = re.findall(r'^(?:(?!error).)*$', log, re.IGNORECASE | re.MULTILINE)
# 輸出：['INFO: Operation started\n', 'DEBUG: Debugging complete']

urls = ['/api/user', '/test/v1', '/report/test']
valid_urls = [u for u in urls if re.search(r'^(?!.*test).+$', u)]
# 輸出：['/api/user']

routes = ['/home', '/admin/dashboard', '/user/profile']
public_routes = [r for r in routes if not re.search(r'/admin', r)]
# 輸出：['/home', '/user/profile']

^(?!.*admin).+$  # 在長文本中匹配時，引擎需遍歷所有可能路徑

pattern = r'^(?=.*[A-Z])(?!.*ABC).+$'
re.match(pattern, "XyZ123")  # 匹配成功
re.match(pattern, "ABCdef")  # 匹配失敗

amounts = ["100.00", "稅后200", "300元"]
valid = [a for a in amounts if re.match(r'^\d+\.?\d{0,2}$(?<!稅)', a)]
# 輸出：['100.00', '300元']