如何从字符串列表中获取所有日期

import re

def extract_dates(string_list):
    date_pattern = r'\b\d{4}-\d{2}-\d{2}\b'
    dates = []

    for string in string_list:
        matches = re.findall(date_pattern, string)
        dates.extend(matches)

    return dates

string_list = [
    "今天是2021-08-25，明天是2021-08-26。",
    "会议安排在2021-09-01。",
    "生日是2021-12-31。",
    "无日期信息"
]

dates = extract_dates(string_list)
print(dates)

import re

def extract_dates(string_list):
    date_pattern = r'\b(\d{4}-\d{1,2}-\d{1,2}|\d{4}/\d{1,2}/\d{1,2})\b'
    dates = []

    for string in string_list:
        matches = re.findall(date_pattern, string)
        dates.extend(matches)

    return dates

string_list = [
    "今天是2021-08-25，明天是2021-08-26。",
    "会议安排在2021/09/01。",
    "生日是2021-12-31。",
    "无日期信息"
]

dates = extract_dates(string_list)
print(dates)