Java Matcher appendTail(StringBuilder)用法及代碼示例

Matcher類的appendTail(StringBuilder)方法的行為類似於append-and-replace方法。此方法讀取輸入字符串，並將其附加到給定StringBuilder的末尾位置。

用法:

public StringBuilder appendTail(StringBuilder builder)

參數：此方法采用參數構建器，該參數構建器是存儲目標字符串的StringBuilder。

返回值：此方法返回替換了目標String的StringBuilder。

下麵的示例說明Matcher.appendTail()方法：

示例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()); 
    } 
}

輸出：

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

示例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()); 
    } 
}

輸出：

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

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

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