如何在python中使用regex合并来自同一用户的字符串\句子

import re

def merge_strings_by_user(strings):
    merged_strings = {}
    regex_pattern = r'User(\d+): (.+)'

    for string in strings:
        match = re.match(regex_pattern, string)
        if match:
            user_id = match.group(1)
            user_string = match.group(2)
            if user_id in merged_strings:
                merged_strings[user_id] += ' ' + user_string
            else:
                merged_strings[user_id] = user_string

    return merged_strings

# 示例输入
strings = [
    "User1: Hello",
    "User2: How are you?",
    "User1: I'm good, thanks!",
    "User2: That's great!"
]

merged_strings = merge_strings_by_user(strings)

# 输出合并后的字符串
for user_id, merged_string in merged_strings.items():
    print(f"User{user_id}: {merged_string}")