在python中解析多行字符串中的消息

import re

# 多行字符串
message = """
Subject: Important Message
From: John Doe <johndoe@example.com>
To: Jane Smith <janesmith@example.com>

Hello Jane,

This is an important message.

Best regards,
John
"""

# 使用正则表达式匹配消息内容
pattern = r'(?<=Subject:).*?(?=\n\n)'
matches = re.search(pattern, message, re.DOTALL)
if matches:
    parsed_message = matches.group(0).strip()
    print(parsed_message)
else:
    print("No message found.")

# 使用字符串处理方法解析消息内容
start_index = message.find('Subject:') + len('Subject:')
end_index = message.find('\n\n', start_index)
parsed_message = message[start_index:end_index].strip()
print(parsed_message)