Matcher lookingAt() method in Java with Examples

The lookingAt() method of Matcher Class attempts to match the pattern partially or fully in the matcher. It returns a boolean value showing if the pattern was matched even partially or fully starting from the start of the pattern.

Syntax:

public boolean lookingAt()

Parameters: This method do not takes any parameter.



Return Value: This method returns a boolean value showing if a prefix of the input sequence matches this matcher’s pattern.

Below examples illustrate the Matcher.lookingAt() method:

Example 1:

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// Java code to illustrate lookingAt() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "Geeks";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);
  
        // Get the possible result
        // using lookingAt() method
        System.out.println(matcher.lookingAt());
    }
}

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Output:

true

Example 2:

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// Java code to illustrate lookingAt() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "GFG";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);
  
        // Get the possible result
        // using lookingAt() method
        System.out.println(matcher.lookingAt());
    }
}

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Output:

true

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#lookingAt–



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