Java RegEx 乐趣 - 玩转句子

Question

输入字符串:

Lorem ipsum tip. Lorem ipsum loprem ipsum septum #match this#, lorem ipsum #match this too#. #Do not match this because it is already after a period#.

期望的输出:

Lorem ipsum tip. #match this# #match this too# Lorem ipsum loprem ipsum septum, lorem ipsum. #Do not match this because it is already after a period#.

请注意，#match this# 和 #match this too# 均已移至最近的句点 (.) 旁边。基本上，## 中的所有内容都应移至左侧最近的句点。

RegEx 和 Java 字符串处理可以完成这个任务吗？

匹配#anything#的最基本的正则表达式是这样的:

\#(.*?)\#

除此之外我还遇到困难。

编辑:您不必告诉我如何编写完整的程序。我只需要一个足够的正则表达式解决方案，然后我将尝试自己的字符串操作。

这是我的解决方案，源自 glowcoder 的答案:

public static String computeForSlashline(String input) {

   String[] sentences = input.split("\\.");

   StringBuilder paragraph = new StringBuilder();
   StringBuilder blocks = new StringBuilder();

   Matcher m;

   try {

      // Loop through sentences, split by periods. 
      for (int i = 0; i < sentences.length; i++) {

         // Find all the #____# blocks in this sentence
         m = Pattern.compile("(\\#(.*?)\\#)").matcher(sentences[i]);

         // Store all the #____# blocks in a single StringBuilder
         while (m.find()) {

            blocks.append(m.group(0));

         }

         // Place all the #____# blocks at the beginning of the sentence. 
         // Strip the old (redundant) #____# blocks from the sentence.
         paragraph.append(blocks.toString() + " " + m.replaceAll("").trim() + ". ");

         // Clear the #____# collection to make room for the next sentence.
         blocks.setLength(0);

   }

   } catch(Exception e) { System.out.println(e); return null; } 

   // Make the paragraph look neat by adding line breaks after
   // periods, question marks and #_____#. 
   m = Pattern.compile("(\\. |\\.&nbsp;|\\?|\\])").matcher(paragraph.toString());

   return m.replaceAll("$1<br /><br />");

}

这给了我想要的输出。然而，有一个问题:如果 #__# 之间有一个句点(例如:#Mrs. Smith 在敏感点踢了 Smith 女士#)，输入.split("\\."); 行将分解 #__#。因此，我将用 RegEx 替换 input.split() 行。

Answer 1

我将使用的骨架如下:

String computeForSlashline(String input) {

    String[] sentences = input.split("\.");
    for(int i = 0; i < sentences.length; i++) {
        // perform a search on each sentence, moving the #__# to the front
    }
    StringBuilder sb = new StringBuilder();
    for(String sentence : sentences) {
        sb.append(sentence).append(". ");
    }
    return sb.toString().trim();

}