Replace specific string by another - String#replaceAll()

问题

I'm actually developping a parser and I'm stuck on a method.

I need to clean specifics words in some sentences, meaning replacing those by a whitespace or a nullcharacter. For now, I came up with this code:

private void clean(String sentence)
{
    try {
        FileInputStream fis = new FileInputStream(
                ConfigHandler.getDefault(DictionaryType.CLEANING).getDictionaryFile());
        BufferedReader bis = new BufferedReader(new InputStreamReader(fis));
        String read;
        List<String> wordList = new ArrayList<String>();

        while ((read = bis.readLine()) != null) {
            wordList.add(read);
        }
    }
    catch (IOException e) {
        e.printStackTrace();
    }

    for (String s : wordList) {
        if (StringUtils.containsIgnoreCase(sentence, s)) { // this comes from Apache Lang
            sentence = sentence.replaceAll("(?i)" + s + "\\b", " ");
        }
    }

    cleanedList.add(sentence);

}

But when I look at the output, I got all of the occurences of the word to be replaced in my sentence replaced by a whitespace.

Does anybody can help me out on replacing only the exact words to be replaced on my sentence?

Thanks in advance !

回答1:

There are two problems in your code:

You are missing the \b before the string
You will run into issues if any of the words from the file has special characters

To fix this problem construct your regex as follows:

sentence = sentence.replaceAll("(?i)\\b\\Q" + s + "\\E\\b", " ");

sentence = sentence.replaceAll("(?i)\\b" + Pattern.quote(s) + "\\b", " ");

来源：https://stackoverflow.com/questions/35889377/replace-specific-string-by-another-stringreplaceall

标签

java

regex

parsing

replaceall