Matcher appendTail(StringBuilder) method in Java with Examples

Last Updated : 27 Nov, 2018

The appendTail(StringBuilder) method of Matcher Class behaves as a append-and-replace method. This method reads the input string and appends it to the given StringBuilder at the tail position.

Syntax:

public StringBuilder appendTail(StringBuilder builder)

Parameters: This method takes a parameter builder which is the StringBuilder that stores the target string.

Return Value: This method returns a StringBuilder with the target String replaced.

Below examples illustrate the Matcher.appendTail() method:

Example 1:

// 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()); 
    } 
} 

Output:

Before Replacement: GeeksForGeeks Geeks for For Geeks Geek
After Replacement: GFGForGFG GFG for For GFG Geek

Example 2:

// 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()); 
    } 
} 

Output:

Before Replacement:  FGF GFG GFG FGF
After Replacement:  Geeks GFG GFG Geeks

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#appendTail-java.lang.StringBuilder-

StringBuffer append() Method in Java with Examples

Kirti_Mangal

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Matcher appendTail(StringBuilder) method in Java with Examples

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