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Matcher lookingAt() method in Java with Examples
The java.util.regex.Matcher class represents an engine that performs various match operations. There is no constructor for this class, you can create/obtain an object of this class using the matches() method of the class java.util.regex.Pattern.
The lookingAt() method of the Matcher class matches the given input text with the pattern, starting from the beginning of the region. In case of a match, this method returns true, else, false. Unlike the matches() method this method doesn’t require a match in the entire region to return true.
Example 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
public static void main(String[] args) {
String regex = "(.*)(\d+)(.*)";
String input = "This is a sample Text, 1234, with numbers in between. "
+ "\n This is the second line in the text "
+ "\n This is third line in the text";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(input);
//checking for the match
if(matcher.lookingAt()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
}
}Output
Match found
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LookingAtExample {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter String1: ");
String input1 = sc.nextLine();
System.out.println("Enter String2: ");
String input2 = sc.nextLine();
System.out.println("Enter String3: ");
String input3 = sc.nextLine();
String input = input1+"\n"+input2+"\n"+input3;
System.out.println(input);
//Regular expression to match a word that contain digits
String regex = ".*\d+.*";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
//verifying whether match occurred
boolean bool = matcher.lookingAt();
if(bool) {
System.out.println("Given input contains digit");
} else {
System.out.println("Given input does not contain any digit");
}
}
}Output
Enter String1: sample text2 Enter String2: data Enter String3: sample sample text2 data sample Given input contains digit
Updated on: 20-Nov-2019
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