Matcher appendTail(StringBuilder) 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 = "GFG";
        StringBuilder builder = new StringBuilder();

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

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

        // Print the replaced matcher
        System.out.println("After Replacement: "
                           + builder.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 GFG GFG 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 = "Geeks";
        StringBuilder builder = new StringBuilder();

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

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

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