python re模块实例记录

匹配字符串中的日期时间

import json
if __name__ == '__main__':
    import re
    import datetime

    s = {"siteID": "123",
         "msgTime": "2022-08-05 13:12:33",
         "floorID": "",
         "beginTime": "2022-08-05 13:12:33",}
    ctime_s = datetime.datetime.now()
    ctime = datetime.datetime.strftime(ctime_s, "%Y-%m-%d %H:%M:%S")
    s = json.dumps(s)
    p = re.compile(r'(\d{4}-\d{1,2}-\d{1,2}\s\d{1,2}:\d{1,2}:\d{1,2})').findall(s)
    print(p)

结果：

替换字符串中的日期时间

import json

if __name__ == '__main__':
    import re
    import datetime

    s = {"siteID": "123",
         "msgTime": "2022-08-05 13:12:33",
         "floorID": "",
         "beginTime": "2022-08-05 13:12:33",}
    ctime_s = datetime.datetime.now()
    ctime = datetime.datetime.strftime(ctime_s, "%Y-%m-%d %H:%M:%S")
    s = json.dumps(s)
    s_new = re.sub(r'(\d{4}-\d{1,2}-\d{1,2}\s\d{1,2}:\d{1,2}:\d{1,2})', ctime, s)
    print(s_new)

结果：

替换字符串中的日期

ctime_s = datetime.datetime.now()
ctime = datetime.datetime.strftime(ctime_s, "%Y-%m-%d")
json_file = re.sub(r'(\d{4}-\d{1,2}-\d{1,2})', ctime, json_file.read())