Finding word using regular expression

This Example describes the way to find the word from the String using expression. For this we are going to make program named Findone.java. The steps involved in program Findone.java are described below:-

Pattern p = Pattern.compile("Java"): Creating a pattern object and compiling the given regular expression into a pattern.

String text = " JavaSun's regex library Java is now Java": Declaring text in which word java is to be find out.

Matcher matcher = p.matcher(text): Creates a matcher for matching the given input against pattern p.

(matcher.find()): This is the method of matcher class which is used for finding the next subsequence of the input sequence and it usually returns a boolean value.

(matcher.group()): This method returns the input matched by the first match

Findone.java

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

public class Findone {
public static void main(String args[]) {
    Pattern p = Pattern.compile("Java");

    String text = " JavaSun's regex library Java is now Java";
    Matcher matcher = p.matcher(text);

    while (matcher.find()) {
      System.out.println(matcher.group());
    }

  }
}

Output of the program:-

Java
Java
Java

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