Check if a string is Date format by Regex - Java java.util.regex

Java examples for java.util.regex:Match Date Time

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Description

Check if a string is Date format by Regex

Demo Code


//package com.java2s;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

    public static final String DATE_ALL = "((^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._]?)(10|12|0?[13578])([-\\/\\._]?)(3[01]|[12][0-9]|0?[1-9])$)"
            + "|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._]?)(11|0?[469])([-\\/\\._]?)(30|[12][0-9]|0?[1-9])$)"
            + "|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._]?)(0?2)([-\\/\\._]?)(2[0-8]|1[0-9]|0?[1-9])$)|(^([2468][048]00)([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$)|(^([3579][26]00)"
            + "([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$)"
            + "|(^([1][89][0][48])([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$)|(^([2-9][0-9][0][48])([-\\/\\._]?)"
            + "(0?2)([-\\/\\._]?)(29)$)"
            + "|(^([1][89][2468][048])([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$)|(^([2-9][0-9][2468][048])([-\\/\\._]?)(0?2)"
            + "([-\\/\\._]?)(29)$)|(^([1][89][13579][26])([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$)|"
            + "(^([2-9][0-9][13579][26])([-\\/\\._]?)(0?2)([-\\/\\._]?)(29)$))";

    public static boolean isDate(String str) {
        return Regular(str, DATE_ALL);
    }//from w w  w  .j a va  2  s.c o m

    private static boolean Regular(String str, String pattern) {
        if (null == str || str.trim().length() <= 0)
            return false;
        Pattern p = Pattern.compile(pattern);
        Matcher m = p.matcher(str);
        return m.matches();
    }
}

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