Java 中的 Matcher appendReplacement(StringBuilder，String)方法，示例

原文:https://www . geesforgeks . org/matcher-appendreplacementstringbuilder-string-method-in-Java-with-examples/

匹配器类的追加替换(StringBuilder，String) 方法表现为追加替换方法。此方法读取输入字符串，并用匹配器字符串中匹配的模式替换它。

语法:

public Matcher 
    appendReplacement(StringBuilder builder, 
                      String stringToBeReplaced)

参数:该方法取两个参数:

  • Builder : StringBuilder that stores the target string.
  • [T0】 String tobe replaced 【T1]: the string to be replaced in the matcher.

返回值:该方法返回一个替换了目标字符串的匹配器。

异常:此方法抛出以下异常:

  • [illegalstateexception] : If you have not tried to match, or if the previous matching operation failed.
  • [T0】 IllegalArgumentException 【T1]: If the replacement string refers to the named capture group that does not exist in the pattern.
  • Indexoutoofboundsexception : If the replacement string refers to the capture group that does not exist in the pattern.

下面的例子说明了 Matcher.appendReplacement()方法:

例 1:

// Java code to illustrate appendReplacement() 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";
        StringBuilder builder = new StringBuilder();

        // Replace every matched pattern
        // with the target String
        // using appendReplacement() method
        while (matcher.find()) {
            matcher.appendReplacement(builder,
                                      stringToBeReplaced);
        }
        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: GEEKSForGEEKS GEEKS for For GEEKS Geek

例 2:

// Java code to illustrate appendReplacement() 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";
        StringBuilder builder = new StringBuilder();

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

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

输出:

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

参考:https://docs . Oracle . com/javase/9/docs/API/Java/util/regex/matcher . html # append replacement-Java . lang . stringbuilder-Java . lang . string-

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