Matcher appendTail(StringBuffer) method in Java with Examples

// Java code to illustrate appendTail() 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);

        System.out.println("Before Replacement: " + stringToBeMatched);

        // Get the String to be replaced
        String stringToBeReplaced = "GEEKS";
        StringBuffer buffer = new StringBuffer();

        // Replace every matched pattern
        // with the target String
        while (matcher.find()) {
            matcher.appendReplacement(buffer,
                                      stringToBeReplaced);
        }

        // Add the replaced string at the tail
        // using the appendTail() method
        matcher.appendTail(buffer);

        // Print the replaced matcher
        System.out.println("After Replacement: "
                           + buffer.toString());
    }
}

// Java code to illustrate appendTail() 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 FGF FGF FGF";

        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);

        System.out.println("Before Replacement: "
                           + stringToBeMatched);

        // Get the String to be replaced
        String stringToBeReplaced = "GFG";
        StringBuffer buffer = new StringBuffer();

        // Replace every matched pattern
        // with the target String
        while (matcher.find()) {
            matcher.appendReplacement(buffer,
                                      stringToBeReplaced);
        }

        // Add the replaced string at the tail
        // using the appendTail() method
        matcher.appendTail(buffer);

        // Print the replaced matcher
        System.out.println("After Replacement: "
                           + buffer.toString());
    }
}