Java 中的 Matcher appendTail(StringBuilder)方法，示例
原文:https://www . geesforgeks . org/matcher-appendtailsringbuilder-method-in-Java-with-examples/
匹配器类的appendTail(StringBuilder)方法表现为一种追加和替换方法。此方法读取输入字符串，并将其附加到尾部位置的给定 StringBuilder。
语法:
public StringBuilder appendTail(StringBuilder builder)
参数:这个方法取一个参数 builder ，它是存储目标字符串的 StringBuilder。
返回值:该方法返回一个替换了目标字符串的字符串生成器。
下面的例子说明了 Matcher.appendTail()方法:
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());
}
}
输出:
Before Replacement: GeeksForGeeks Geeks for For Geeks Geek
After Replacement: GFGForGFG GFG for For GFG Geek
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());
}
}
输出:
Before Replacement: FGF GFG GFG FGF
After Replacement: Geeks GFG GFG Geeks
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