Java Matcher lookingAt() method

The lookingAt() method of Matcher class is used to match the input sequence against the beginning of the text. This method is similar to matches() except the difference that matches() match the regular expression against the whole text.

Syntax:

Parameter

No parameter

Returns

true if, and only if, a prefix of the input sequence matches this matcher's pattern

Example 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherlookingAtExample1 {
	public static void main(String[] args) {
		    Pattern pattern = Pattern.compile("This is", Pattern.CASE_INSENSITIVE);
	        Matcher matcher = pattern.matcher("this is java language");
	        System.out.println("lookingAt = " + matcher.lookingAt());      
	}
}

Output:

lookingAt = true

Example 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherlookingAtExample2 {
	public static void main(String[] args) {
        String input    =
                "java programming language " +
                " Write once run anywhere";

        String regex= "java programm";
 	 Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(input);
        // searches against the beginning of the text only
        System.out.println("lookingAt = " + matcher.lookingAt());
        //Searches against the whole text
        System.out.println("matches   = " + matcher.matches());
    }
}

Output:

lookingAt = true
matches   = false

Example 3

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchelookingAtExample3 {
	public static void main(String[] args) {
        String input    = "java programming language " +
                		" Write once run anywhere";

        String regex= "java programm";
        Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(input);
        // searches against the beginning of the text only
        System.out.println(" lookingAt = " + m.lookingAt());
        if(m.lookingAt())
        	System.out.println("  "+m.toString());      
    }
}

Output:

  lookingAt = true
  java.util.regex.Matcher[pattern=java programm region=0,50 lastmatch=java programm]

Next TopicJava-matcher-matches-method

← prev next →

Java Matcher lookingAt() method

Syntax:

Parameter

Returns

Example 1

Example 2

Example 3

Learn Important Tutorial

B.Tech / MCA

Preparation

Contact info

Follow us

Tutorials

Interview Questions

Online Compiler

Python

AI, ML and Data Science

Java

B.Tech and MCA

Web Technology

Software Testing

Technical Interview

Java Interview

Web Interview

Database Interview

Company Interviews

Java Methods

Java Calendar

Java Process

Java Timer

Java Timertask

Java Character

Java Currency

Java Random

Java Scanner

Java Locale

Java System

Java TimeZone

Java TreeSet

Java Enum

Java EnumMap

Java Matcher

Java PriorityQueue

Java Throwable

Java Double

Java ThreadGroup

Java ThreadLocalRandom

Java HashSet

Java Float

Java Short

Java StringBuffer

Java StringBuilder

Java ThreadLocal

Java Matcher lookingAt() method

Syntax:

Parameter

Returns

Example 1

Example 2

Example 3

Learn Important Tutorial

B.Tech / MCA

Preparation

Contact info

Follow us

Tutorials

Interview Questions

Online Compiler