How to match a particular word in a string using Pattern class in Java?

JavaObject Oriented ProgrammingProgramming

The \b meta character in Java regular expressions matches the word boundaries Therefore to find a particular word from the given input text specify the required word within the word boundaries in the regular expressions as −

"\\brequired word\\b";

Example 1

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MachingWordExample1 {
   public static void main( String args[] ) {
      //Reading string value
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter input string");
      String input = sc.next();
      //Regular expression to find digits
      String regex = "\\bhello\\b";
      //Compiling the regular expression
      Pattern pattern = Pattern.compile(regex);
      //Retrieving the matcher object
      Matcher matcher = pattern.matcher(input);
      if(matcher.find()) {
         System.out.println("Match found");
      } else {
         System.out.println("Match not found");
      }
   }
}

Output

Enter input string
hello welcome to Tutorialspoint
Match found

Example 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherExample2 {
   public static void main( String args[] ) {
      String input = "This is sample text \n " + "This is second line " + "This is third line";
      String regex = "\\bsecond\\b";
      //Compiling the regular expression
      Pattern pattern = Pattern.compile(regex);
      //Retrieving the matcher object
      Matcher matcher = pattern.matcher(input);
      if(matcher.find()) {
         System.out.println("Match found");
      } else {
         System.out.println("Match not found");
      }
   }
}

Output

Match found
raja
Published on 21-Nov-2019 07:23:55
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