Java正则表达式匹配一个时间格式的字符串
验证每个月的最大天数如下：
Calendar. getInstance( ).getActualMaximum(Calendar.DAY_OF_MONTH) ;
import java.util.regex.Matcher ;
import java.util.regex.Pattern ;
public class TimeUtil {
/**
* 验证时间字符串格式输入是否正确
* @param timeStr
* @return
*/
public static boolean valiDateTimeWithLongFormat(String timeStr ) {
String format = "((19|20)[0-9]{2})-(0?[1-9]|1[012])-(0?[1-9]|[12][0-9]|3[01]) " + "([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]" ;
Pattern pattern = Pattern.compile(format ) ;
Matcher matcher = pattern.matcher(timeStr ) ;
if(matcher.matches() ) {
pattern = Pattern.compile("(\\d{4})-(\\d+)-(\\d+).*" ) ;
matcher = pattern.matcher(timeStr ) ;
if(matcher.matches() ) {
int y = Integer.valueOf(matcher.group(1 ) ) ;
int m = Integer.valueOf(matcher.group(2 ) ) ;
int d = Integer.valueOf(matcher.group(3 ) ) ;
if(d > 28 ) {
Calendar c = Calendar.getInstance() ;
c.set(y , m - 1 , 1 ) ;
int lastDay = c.getActualMaximum(Calendar.DAY_OF_MONTH ) ;
return(lastDay >= d ) ;
}
}
return true ;
}
return false ;
}
public static void main(String [ ] args ) {
System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-5-2 08:02:02" ) ) ;
System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-02-29 08:02:02" ) ) ;
System.out.println(TimeUtil.valiDateTimeWithLongFormat("2015-02-29 08:02:02" ) ) ;
System.out.println(TimeUtil.valiDateTimeWithLongFormat("2016-02-02 082:02" ) ) ;
}
}
输出
