如何捕获捕获子组

Question

我有一些文字如下：

Postprandial Data

Reflux Episode Activity (Impedance)
            Total   Normal

    Postprandial Analysis Settings

Symptom Correlation to Reflux (Impedance)

我想在Symptom Correlation to Reflux (Impedance)

之前找到并删除所有内容

我很遗憾地使用以下代码删除Symptom Correlation to Reflux (Impedance)。我怎么能保留它？我尝试了group(0)和group(1)。

Pattern goPP = Pattern.compile("(Postprandial Data.*)Symptom Correlation to Reflux",Pattern.DOTALL);
            Matcher goPP_pattern = goPP.matcher(s);
            //This splits the original document into the Main stuff and the postprandial stuff so extraction should be more straightforward
            String PPStr="";
                        while (goPP_pattern.find()) {
                   for (String df:goPP_pattern.group(1).split("\n")){
                        PPStr=PPStr+df+"\n";
                    s = s.replace(df,"");
                   }
                 }

Answer 1

这个正则表达式足以满足您的需求

(?s)Postprandial Data.*?(?=Symptom Correlation to Reflux \(Impedance\))

<强> Regex Demo

Java代码

System.out.println(ln.replaceAll("(?s)Postprandial Data.*?(?=Symptom Correlation to Reflux \\(Impedance\\))", ""));

<强> Ideone Demo