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Matcher hasTransparentBounds() 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.
In regular expressions, the lookbehind and lookahead constructs are used to match a particular pattern that is preceding or, succeeding in some other pattern. For example, if you need to accept a string which accepts 5 to 12 characters the regular expression will be −
"\A(?=\w{6,10}\z)";By default, the boundaries of the matcher region are not transparent to the constructs lookahead, lookbehind and, boundary matching i.e. These constructs cannot match contents of the input text beyond the region boundaries −
The hasTransparentBounds() method of this class method verifies whether the current matcher uses transparent bounds if so, it returns true else, it returns false.
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HasTransparentBounds {
public static void main(String[] args) {
//Regular expression to accepts 6 to 10 characters
String regex = "\A(?=\w{6,10}\z)";
System.out.println("Enter 5 to 12 characters: ");
String input = new Scanner(System.in).next();
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(input);
//Setting region to the input string
matcher.region(0, 4);
if(matcher.find()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
boolean bool = matcher.hasTransparentBounds();
//Switching to transparent bounds
if(bool) {
System.out.println("Current matcher uses transparent bounds");
} else {
System.out.println("Current matcher user non-transparent bound");
}
}
}Output
Enter 5 to 12 characters: sampletext Match not found Current matcher user non-transparent bound
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HasTransparentBounds {
public static void main(String[] args) {
//Regular expression to accepts 6 to 10 characters
String regex = "\A(?=\w{6,10}\z)";
System.out.println("Enter 5 to 12 characters: ");
String input = new Scanner(System.in).next();
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(input);
//Setting region to the input string
matcher.region(0, 4);
matcher.useTransparentBounds(true);
if(matcher.find()) {
System.out.println("Match found");
} else {
System.out.println("Match not found");
}
boolean bool = matcher.hasTransparentBounds();
//Switching to transparent bounds
if(bool) {
System.out.println("Current matcher uses transparent bounds");
} else {
System.out.println("Current matcher user non-transparent bound");
}
}
}Output
Enter 5 to 12 characters: sampletext Match found Current matcher uses transparent bounds
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