Tuesday 26 December 2017

How to use metacharacter OR class | Java Regex | Java Regular Expressions | Regex in java


Click here to watch on Youtube : 
https://www.youtube.com/watch?v=kA9rnZ5eubU&list=UUhwKlOVR041tngjerWxVccw

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

/**
 * OR Class Example
 */

public class RegexDemo
{

    public static void main(String[] args)
    {
        /*
         * [abc] - Any of the elements in the set is matched
         */

        calculateMatches("[abc]", "b");
        calculateMatches("[abc]", "cab");
        calculateMatches("[abc]", "caABZ9");

        /*
         * They can also be alternated as part of a String. In the
         * following example, when we create different words by
         * alternating the first letter with each element of the set,
         * they are all matched:
         */

        calculateMatches("[bcr]at", "bat cat rat zat");

    }

    private static void calculateMatches(String regex, String inputText)
    {
        Pattern pattern = Pattern.compile(regex);
        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);
    }

}

Output

Number of Matches = 1
Number of Matches = 3
Number of Matches = 2
Number of Matches = 3

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_metachar_or_class.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_metachar_or_class

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/57d5e7f2c5fabff367c40b36a92925e1158e7f5a/BasicJava/RegexDemo_metachar_or_class/?at=master

See also:
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