Java 正则表达式不匹配任何内容

Question

String string = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<Request>\n" +
            "  <Item>\n" +
            "    <Type>C0401</Type>\n" +
            "    <InvDate>20150301</InvDate>\n" +
            "    <No>PK1000000</No>\n" +
            "  </Item>\n" +
            "  <Item>\n" +
            "    <Type>C0401</Type>\n" +
            "    <InvDate>20150301</InvDate>\n" +
            "    <No>PK1000002</No>\n" +
            "  </Item>\n" +
            "</Request>";
    Pattern pattern = Pattern.compile("(<Item>)(.*)(</Item>)");
    Matcher matcher = pattern.matcher(string);

    List<String> listMatches = new ArrayList<String>();

    while(matcher.find())
    {
        listMatches.add(matcher.group(2));
    }

如果我将 Item 替换为 Type 或 InvDate 或 No，我就可以获得内容。

寻找答案。谢谢

Answer 1

对于多行机器，您必须使用选项Pattern.DOTALL:

Pattern pattern = Pattern.compile("(<Item>)(.*?)(</Item>)",Pattern.DOTALL);

量词:*?零到无限次之间，尽可能少的次数，按需扩展[懒惰]