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:
// 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());    }} |
Output:
true
Example 2:
// 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());    }} |
Output:
true
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#lookingAt–
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