最近正则表达式突然开窍了，之前看完就忘记，这一年多时间隔段时间用一次，终于不容易忘了，来个实现字符串是企业微信返回的考勤数据，找出所有打卡时间的功能，调试正则表达式有一种类似摸石头过河的感觉，扔个石头试试不行，再扔个。
1、原始数据
{"errcode":0,"errmsg":"ok","checkindata":[{"userid":"PanPengYan","groupname":"固定1","checkin_type":"上班打卡","exception_type":"未打卡","checkin_time":1579395600,"location_title":"","location_detail":"","wifiname":"","notes":"","wifimac":"","mediaids":[],"lat":0,"lng":0},{"userid":"ZhaoGaoJian","groupname":"固定1","checkin_type":"上班打卡","exception_type":"未打卡","checkin_time":1579395600,"location_title":"","location_detail":"","wifiname":"","notes":"","wifimac":"","mediaids":[],"lat":0,"lng":0},{"userid":"PanPengYan","groupname":"固定1","checkin_type":"上班打卡","exception_type":"未打卡","checkin_time":1579424460,"location_title":"","location_detail":"","wifiname":"","notes":"","wifimac":"","mediaids":[],"lat":0,"lng":0},{"userid":"ZhaoGaoJian","groupname":"固定1","checkin_type":"上班打卡","exception_type":"未打卡","checkin_time":1579424460,"location_title":"","location_detail":"","wifiname":"","notes":"","wifimac":"","mediaids":[],"lat":0,"lng":0}]}
2、正则表达式
checkin_time":(\d+)\,
3、最终代码
class Program { static void Main(string[] args) { string text = "{\"errcode\":0,\"errmsg\":\"ok\",\"checkindata\":[{\"userid\":\"PanPengYan\",\"groupname\":\"固定1\",\"checkin_type\":\"上班打卡\",\"exception_type\":\"未打卡\",\"checkin_time\":1579395600,\"location_title\":\"\",\"location_detail\":\"\",\"wifiname\":\"\",\"notes\":\"\",\"wifimac\":\"\",\"mediaids\":[],\"lat\":0,\"lng\":0},{\"userid\":\"ZhaoGaoJian\",\"groupname\":\"固定1\",\"checkin_type\":\"上班打卡\",\"exception_type\":\"未打卡\",\"checkin_time\":1579395600,\"location_title\":\"\",\"location_detail\":\"\",\"wifiname\":\"\",\"notes\":\"\",\"wifimac\":\"\",\"mediaids\":[],\"lat\":0,\"lng\":0},{\"userid\":\"PanPengYan\",\"groupname\":\"固定1\",\"checkin_type\":\"上班打卡\",\"exception_type\":\"未打卡\",\"checkin_time\":1579424460,\"location_title\":\"\",\"location_detail\":\"\",\"wifiname\":\"\",\"notes\":\"\",\"wifimac\":\"\",\"mediaids\":[],\"lat\":0,\"lng\":0},{\"userid\":\"ZhaoGaoJian\",\"groupname\":\"固定1\",\"checkin_type\":\"上班打卡\",\"exception_type\":\"未打卡\",\"checkin_time\":1579424460,\"location_title\":\"\",\"location_detail\":\"\",\"wifiname\":\"\",\"notes\":\"\",\"wifimac\":\"\",\"mediaids\":[],\"lat\":0,\"lng\":0}]}"; string pattern = @"checkin_time"":(\d+)\,"; //MatchCollection mc = Regex.Matches(text, pattern); Regex rex = new Regex(pattern, RegexOptions.IgnoreCase); MatchCollection matches = rex.Matches(text); //提取匹配项 foreach (Match match in matches) { GroupCollection groups = match.Groups; Console.WriteLine(string.Format("<br/>{0} 共有 {1} 个分组：{2}<br/>" , match.Value, groups.Count, pattern)); //提取匹配项内的分组信息 for (int i = 0; i < groups.Count; i++) { Console.WriteLine( string.Format("分组 {0} 为 {1}，位置为 {2}，长度为 {3}<br/>" , i , groups[i].Value , groups[i].Index , groups[i].Length)); } } //提取匹配项 foreach (Match match in matches) { CaptureCollection captures = match.Captures; Console.WriteLine(string.Format("<br/>{0} 共有 {1} 个匹配：{2}<br/>" , match.Value, captures.Count, pattern)); //提取匹配项内的分组信息 for (int i = 0; i < captures.Count; i++) { Console.WriteLine( string.Format("匹配 {0} 为 {1}，位置为 {2}，长度为 {3}<br/>" , i , captures[i].Value , captures[i].Index , captures[i].Length)); } } Console.ReadKey(); } }
4、输出结果