如何在具有可选参数的同一Python函数中匹配更多正则表达式选项？

import re

def match_regex(text, patterns, options=None):
    """
    text: 要搜索的文本
    patterns: 一个字典，键是正则表达式的描述，值是正则表达式字符串
    options: 可选的正则表达式选项列表，例如 [re.IGNORECASE, re.MULTILINE]
    """
    if options is None:
        options = []
    
    for desc, pattern in patterns.items():
        # 将选项合并为一个标志位
        flags = 0
        for opt in options:
            flags |= opt
        
        # 编译正则表达式
        compiled_pattern = re.compile(pattern, flags)
        
        # 执行匹配
        match = compiled_pattern.search(text)
        if match:
            print(f"Pattern '{desc}' matched: {match.group()}")
        else:
            print(f"Pattern '{desc}' did not match.")

# 使用示例
text = "Hello, World! This is a test. Hello again."
patterns = {
    "hello": r"hello",
    "world": r"world",
    "test": r"test"
}

# 使用忽略大小写的选项
options = [re.IGNORECASE]

match_regex(text, patterns, options)