JAVA EE: How to use Quantifiers a{2,3} | Java Regex | Java Regular Expressions

Wednesday, 3 January 2018

How to use Quantifiers a{2,3} | Java Regex | Java Regular Expressions | Regex in java

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RegexDemo.java

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

 *

 * Quantifiers

 *

 */

public class RegexDemo

{

    public static void main(String[] args)

    {

        /*

         * We’ve specified at least two occurrences but not exceeding

         * three.

         */

        isMatch("a{2,3}", "aa");

        isMatch("a{2,3}", "aaa");

        isMatch("a{2,3}", "a");

        isMatch("a{2,3}", "aaaaaa");

    }

    private static void isMatch(String regex, String inputText)

    {

        Pattern pattern = Pattern.compile(regex);

        Matcher matcher = pattern.matcher(inputText);

        System.out.println("Regex = " + regex + " , " + "InputText = "

                + inputText + " is matching? = " + matcher.matches());

    }

}

Output

Regex = a{2,3} , InputText = aa is matching? = true

Regex = a{2,3} , InputText = aaa is matching? = true

Regex = a{2,3} , InputText = a is matching? = false

Regex = a{2,3} , InputText = aaaaaa is matching? = false