如何获取字符串中时间戳中的所有字符

import re
from datetime import datetime

def extract_timestamp_chars(string):
    # 提取时间戳
    timestamps = re.findall(r'\d+', string)
    
    for timestamp in timestamps:
        # 转换为整数类型
        timestamp = int(timestamp)
        
        # 确定时间戳单位（秒或毫秒）
        if len(str(timestamp)) == 10:
            timestamp = timestamp * 1000  # 转换为毫秒
        
        # 转换为日期时间格式
        dt = datetime.fromtimestamp(timestamp)
        print("Timestamp:", timestamp)
        print("Datetime:", dt)
        
        # 获取时间戳中的每个字符
        timestamp_str = str(timestamp)
        for char in timestamp_str:
            print("Character:", char)

# 示例调用
string = "The timestamp is 1634567890"
extract_timestamp_chars(string)