找到模式时替换 [英] Replace While Pattern is Found

问题描述

我试图通过一个字符串，并替换正则表达式匹配字符串的所有实例。由于某些原因，当我使用 if ，那么它将工作，并替换一个正则表达式匹配的字符串实例。当我把 if 更改为，而时，它会对自己进行一些奇怪的替换，并使第一个正则表达式匹配字符串，而不是甚至触及其他... ...

$ $ p $ $ $ $ $ $ $ pattern = Pattern.compile（regex）;
matcher = pattern.matcher（docToProcess）; $（matcher.find（））{
start = matcher.start（）;
end = matcher.end（）;
match = docToProcess.substring（start，end）;
stringBuilder.replace（start，end，createRef（match））;
docToProcess = stringBuilder.toString（）;
}

解决方案

添加了最后的作业。看看是否有帮助：

  //你的代码片段：
 pattern = Pattern.compile（regex）; 
 matcher = pattern.matcher（docToProcess）; $（matcher.find（））{
 start = matcher.start（）; 
 end = matcher.end（）; 
 match = docToProcess.substring（start，end）; 
 String rep = createRef（match）; 
 stringBuilder.replace（start，end，rep）; 
 docToProcess = stringBuilder.toString（）; 
 // my addition：
 System.out.println（Found：'+ matcher.group（）+'）; 
 System.out.println（替换为：'+ rep +'）; 
 System.out.println（ - >+ docToProcess）; 
 matcher = pattern.matcher（docToProcess）; 
} 
  

I'm trying to go through a string and replace all instances of a regex-matching string. For some reason when I use if then it will work and replace just one string instance of a regex-match. When I change the if to while then it does some weird replacement over itself and makes a mess on the first regex-matching string while not even touching the others...

        pattern = Pattern.compile(regex);
        matcher = pattern.matcher(docToProcess);
        while (matcher.find()) {
            start = matcher.start();
            end = matcher.end();
            match = docToProcess.substring(start, end);
            stringBuilder.replace(start, end, createRef(match));
            docToProcess = stringBuilder.toString();
        }

解决方案

Aside from the sysouts I only added the last assignment. See if it helps:

// your snippet:    
pattern = Pattern.compile(regex);
matcher = pattern.matcher(docToProcess);
while (matcher.find()) {
    start = matcher.start();
    end = matcher.end();
    match = docToProcess.substring(start, end);
    String rep = createRef(match);
    stringBuilder.replace(start, end, rep);
    docToProcess = stringBuilder.toString();
    // my addition:
    System.out.println("Found:         '" + matcher.group() + "'");
    System.out.println("Replacing with: '" + rep + "'");
    System.out.println(" --> " + docToProcess);
    matcher = pattern.matcher(docToProcess);
}

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