【Java】正则表达式匹配字符串中的时间戳_正则表达式匹配时间戳

package src.regularExpression;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TimeUtil {


    public static void main(String[] args) {
        String[] temp;
        String str = "\n" +
                "2020-10-22T07:56:07.867Z,,,,asdasdasn" +           
                "2020-10-22T07:56:22.874Z,,,,a's'da's" +              
                "2020-10-22T07:59:33.348Z,,b";
        String regex = "[0-9]{4}[-][0-9]{1,2}[-][0-9]{1,2}";
               // String regex = "[0-9]{4}[-][0-9]{1,2}[-][0-9]{1,2}[T][0-9]{1,2}[:][0-9]{1,2}[:][0-9]{1,2}[.][0-999]{1}";

        Pattern p = Pattern.compile(regex);
        Matcher matcher = p.matcher(str);
        if (matcher.find()) {
            System.out.println(matcher.groupCount());
            System.out.println(matcher.group(0));
        }
        temp = str.split(matcher.group(0));
        for (String i:temp
             ) {
            System.out.println(i);
        }
    }
}
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