JAVA EE: How to use case-insensitive flag | Java Regex | Java Regular Expressions

Monday 8 January 2018

How to use case-insensitive flag | Java Regex | Java Regular Expressions | Regex in java

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RegexDemo.java

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

 * 

 * Flags

 *

 */

public class RegexDemo

{

    public static void main(String[] args)

    {

        /*

         * Pattern.CASE_INSENSITIVE

         * 

         * This flag enables matching regardless of case. By default

         * matching takes case into account

         * 

         * So using this flag, we can change the default behavior:

         */

        calculateMatches("dog", "This is a DOG", Pattern.CASE_INSENSITIVE);

    }

    private static void calculateMatches(String regex, String inputText,

            int flag)

    {

        Pattern pattern = Pattern.compile(regex, flag);

        Matcher matcher = pattern.matcher(inputText);

        int matches = 0;

        /*

         * The find method keeps advancing through the input text and

         * returns true for every match, so we can use it to find the

         * match count as well:

         */

        while (matcher.find())

        {

            ++matches;

        }

        System.out.println("Number of Matches = " + matches);

    }

}