java - 如何在java正则表达式中使用嵌套非捕获组

Question

我有如下一系列行(可以按任何顺序出现)

Distal latency   4.9 N/A N/A 4.0 N/A N/A N/A N/A 6.3 4.4 N/A

 % failed Chicago Classification  70 1 1 0 1 1 1 1 0 0 1

 % panesophageal pressurization  0 0 0 0 0 0 0 0 0 0 0

 % premature contraction  20 0 0 1 0 0 0 0 0 1 0

 % rapid contraction  10 0 0 1 0 0 0 0 0 0 0

 % large breaks  10 0 0 0 0 0 0 0 1 0 0

 % small breaks  10 0 0 1 0 0 0 0 0 0 0

我想最终将行标题和每个值提取到哈希中，如下所示

Distallatency=4.9,Distallatency=N/A etc.
failedChicagoClassification1=70,failedChicagoClassification1=1,failedChicagoClassification1=1,failedChicagoClassification1=0,failedChicagoClassification1=1 etc.

and so on

我的策略是:

1. join the words together by replacing the \s between words
2. End the joined word with a character eg : so I can then split each line into an array based on \s
3. Loop through the array adding the line title to each value into a Hash

这是我到目前为止所做的:

Pattern match_patternSwallow2 = Pattern.compile("(?:.*\\d+\\.\\d|N\\/A|\\d*){4,50}");
Matcher matchermatch_patternSwallow2 = match_patternSwallow2.matcher(s);

while (matchermatch_patternSwallow2.find()){
    String found = matchermatch_patternSwallow2.group(0).trim();
    System.out.println(found);

    //Join up the words so can then split by space
    found = found.replaceAll("([A-Za-z]+)\\s", "$1_").replaceAll("\\s", ":");
    List<String> myList = new ArrayList<String>(Arrays.asList(found.split(":")));

    for (int ff=1;ff<myList.size();ff++){
        mapSwallow.put(myList.get(0)+"MapSwallowsNum"+ff,myList.get(ff));
    }
}

捕获时没有出现任何错误，但它仅在 System.out 行返回一个空字符串。

我做错了什么？

Answer 1

我可以建议以下正则表达式来获取符合您条件的每一行:

"(?m)^\\W*([a-zA-Z].*?)\\s*((?:(?:\\d+(?:\\.\\d+)?|N/A)\\s*)‌​*)$"

请参阅regex demo

详细信息:

• (?m) - 多行模式开启
• ^ - 行的开头
• \\W* - 0+ 个非单词字符
• ([a-zA-Z].*?) -(第 1 组)一个字母，后跟除换行符之外的任意 0 个以上字符，尽可能少，最多
• \\s* - 零个或多个空格
• ((?:(?:\\d+(?:\\.\\d+)?|N/A)\\s*)‌​*) - 第 2 组捕获 0 + 数字序列(后跟一个点和数字(可选))或 N/A 后跟 0+ 个空格
• $ - 行尾。

找到匹配项后，使用 .group(1).replaceAll("\\s+","") 作为键，并拆分 .group(2) 与 .split("\\s+") 来获取值。

查看示例在线代码:

String s = "Distal latency   4.9 N/A N/A 4.0 N/A N/A N/A N/A 6.3 4.4 N/A\n\n % failed Chicago Classification  70 1 1 0 1 1 1 1 0 0 1\n\n % panesophageal pressurization  0 0 0 0 0 0 0 0 0 0 0\n\n % premature contraction  20 0 0 1 0 0 0 0 0 1 0\n\n % rapid contraction  10 0 0 1 0 0 0 0 0 0 0\n\n % large breaks  10 0 0 0 0 0 0 0 1 0 0\n\n % small breaks  10 0 0 1 0 0 0 0 0 0 0";
Pattern match_patternSwallow2= Pattern.compile("(?m)^\\W*([a-zA-Z].*?)\\s*((?:(?:\\d+(?:\\.\\d+)?|N/A)\\s*)*)$");
Matcher matchermatch_patternSwallow2 = match_patternSwallow2.matcher(s);
HashMap<String, String> mapSwallow = new HashMap<String, String>();
while (matchermatch_patternSwallow2.find()){
    String[] myList = matchermatch_patternSwallow2.group(2).split("\\s+");
    String p1 = matchermatch_patternSwallow2.group(1).replaceAll("\\s+", "");
    int line = 1;
    for (String p2s: myList){
        mapSwallow.put(p1+line, p2s);
        line++;
    }
}
System.out.println(mapSwallow);