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How to match a particular word in a string using Pattern class in Java?
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
Updated on: 21-Nov-2019
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