Java：如何在反转拆分字后将分隔符读回字符串？

Question

在反转拆分词后，我不确定如何重新添加定界符。

String fileContent = "def  mnop.STU";
    String delimiter = "[^a-zA-Z0-9']+";
    String[] splitWords = fileContent.split(delimiter);
    StringBuilder stringBuilder = new StringBuilder();
    for (String word : splitWords) {
        StringBuilder output = new StringBuilder(word).reverse();
        stringBuilder.append(output);
    }
    StringJoiner joiner = new StringJoiner(delimiter);
    joiner.add(stringBuilder);
    System.out.println(joiner.toString());

当前输出：fedponmUTS

所需的输出：fed ponm.UTS

Answer 1

不是很优雅，但是你可以做这样的事情吗？

for (String word : splitWords) 
{
    int idx = fileContent.indexOf(word, stringBuilder.length());
    String delim = fileContent.substring(stringBuilder.length(), idx);
    stringBuilder.append(delim);

    StringBuilder output = new StringBuilder(word).reverse();
    stringBuilder.append(output);
}

输出：

fed  ponm.UTS