问题

可以使用Java函数来实现这个任务，无需编写额外的例程。以下是一个示例代码，可以帮助您实现所需的文本替换：

import java.util.regex.*;

public class Main {
    public static void main(String[] args) {
        String inputText = "$F{abc} and $F{def}";
        
        // 使用正则表达式匹配 $F{...} 并提取其中的内容
        Pattern pattern = Pattern.compile("\$F\\{(\\w*)\\}");
        Matcher matcher = pattern.matcher(inputText);
        
        // 替换匹配到的文本
        StringBuffer result = new StringBuffer();
        while (matcher.find()) {
            String replacement = matcher.group(1); // 获取匹配到的内容
            matcher.appendReplacement(result, replacement);
        }
        matcher.appendTail(result);
        
        String outputText = result.toString();
        System.out.println(outputText);
    }
}

运行此代码后，您将获得所需的输出：

abc and def

这段代码使用正则表达式来匹配 $F{...} 格式的文本，并提取其中的内容，然后用提取的内容替换原始文本中的匹配项。

$F{abc} and $F{def}

abc and def

str.replaceAll("\$F\{\\w*\\}", "??" );

答案1

得分: 0

str = str.replaceAll(""\\\$F\\\\{(\\\\w*)}"", "$1");

str = str.replaceAll("\\$F\\{(\\w*)}", "$1");

答案2

得分: 0

更新

我没有完全阅读您的问题。感谢The fourth bird 指出这一点。以下是期望输出 abc and def 的代码

public class Main {
    public static void main(String[] args) {
        String str = "$F{abc} and $F{def}";
        System.out.println(str.replaceAll("\$F\\{(\\w*)\\}", "$1"));
    }
}

输出:

abc and def

您只需要用捕获组(1)替换给定的字符串。原始答案中的解释对此更新仍然有效。

原始答案:

您可以使用正则表达式 (\$F\{)(\w*)(\})，将捕获组(2)替换为 ??，同时保留捕获组(1)和捕获组(3)，如下所示:

public class Main {
    public static void main(String[] args) {
        String str = "$F{abc} and $F{def}";
        System.out.println(str.replaceAll("(\$F\\{)(\\w*)(\\})", "$1??$3"));
    }
}

输出:

$F{??} and $F{??}

查看这里以获取正则表达式 (\$F\{)(\w*)(\}) 中所有捕获组的示例。

public class Main {
	public static void main(String[] args) {
		String str = "$F{abc} and $F{def}";
		System.out.println(str.replaceAll("\$F\\{(\\w*)\\}", "$1"));
	}
}

abc and def

public class Main {
	public static void main(String[] args) {
		String str = "$F{abc} and $F{def}";
		System.out.println(str.replaceAll("(\$F\\{)(\\w*)(\\})", "$1??$3"));
	}
}

$F{??} and $F{??}

答案3

得分: -1

One way is to use the regex (\\$F\\{)|(\\}) you can both remove the $F{ and } parts using replaceAll():

String str = "$F{abc} and $F{def}";
str = str.replaceAll("(\$F\\{|\\})", "");

About regex:

• (\\$F\\{) : 1. group $F{
• | : OR
• (\\}) : 2. group }

The other way is to use a capture group reference in the replacement parameter. $1 stands for the capture group (\\w*) that corresponds to abc and def:

String str = "$F{abc} and $F{def}";
str = str.replaceAll("\$F\\{(\\w*)\\}", "$1");
System.out.println(str);

Output:

abc and def

String str = "$F{abc} and $F{def}";
str = str.replaceAll("(\$F\\{)|(\\})", "");

String str = "$F{abc} and $F{def}";
str = str.replaceAll("\$F\\{(\\w*)\\}", "$1" );
System.out.println(str);

abc and def