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 
" + "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
Updated on 21-Nov-2019 07:24:54

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