Matcher useTransparentBounds(boolean) method in Java with Examples

The useTransparentBounds(boolean) method of Matcher Class is used to set the transparent bounds of this matcher. By transparent bounds, it means that the matcher will be matched for the matching pattern beyond the region boundaries for getting a match, if the transparent bounds are set to true. This method returns a Matcher with the modified transparent bounds.

Syntax:

public boolean useTransparentBounds(
               boolean setTransparentBounds)

Parameters: This method takes a parameter setTransparentBounds which is a boolean value depicting the transparent bounds of this matcher to be modified into.



Return Value: This method returns a Matcher with the modified transparent bounds.

Below examples illustrate the Matcher.useTransparentBounds() method:

Example 1:

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// Java code to illustrate useTransparentBounds() 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 Geeks for For Geeks Geek";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        // set the transparent bounds to true
        // using useTransparentBounds() method
        matcher = matcher
                      .useTransparentBounds(true);
  
        // Check if this matcher
        // has transparent bounds or not
        System.out.println("Does this matcher"
                               + " has transparent bounds: "
                               + matcher.hasTransparentBounds());
    }
}

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Output:

Does this matcher has transparent bounds: true

Example 2:

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// Java code to illustrate useTransparentBounds() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "(FGF)";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "FGF GFG GFG FGF";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        // set the transparent bounds to true
        // using useTransparentBounds() method
        matcher = matcher
                      .useTransparentBounds(false);
  
        // Check if this matcher
        // has transparent bounds or not
        System.out.println("Does this matcher"
                               + " has transparent bounds: "
                               + matcher.hasTransparentBounds());
    }
}

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Output:

Does this matcher has transparent bounds: false

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#useTransparentBounds-boolean-



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