java - 正则表达式在循环中使用 find 方法仅匹配一次

Question

我正在尝试在 Java 中使用正则表达式来提取 { } 之间的所有结果并一次循环一个。

这是我正在使用的代码:

Pattern p = Pattern.compile("(\\{.*})");
Matcher m = p.matcher(validatePage);
while (m.find()) {
    JSONObject jsonObj = new JSONObject(m.group(1));
    System.out.println(jsonObj);
}

这是我正在搜索的文本

<tr><td class='warning'></td><td>test-testing-tester@2016-07-08.txt</td>
<td>TEST</td><td class='warningMessage'>[WARNING]</td><td 
class='warningMessage'>File with the revision 2016-07-08 validated 
successfully and is ready to be published. Warnings were detected. Please 
see report.</td></tr>
{"resourceUri":"test-testing-tester@2016-07-08.txt","severity":"WARNING","lineNumber":43,"column":3,"offset":701,"length":118,"message":"extension, version is missing"}
{"resourceUri":"test-testing-tester@2016-07-08.txt","severity":"WARNING","lineNumber":43,"column":3,"offset":701,"length":118,"message":"extension, release is missing"}
{"resourceUri":"test-testing-tester@2016-07-08.rxt","severity":"WARNING","lineNumber":43,"column":3,"offset":701,"length":118,"message":"extension, correction is missing"}
{"resourceUri":"test-testing-tester@2016-07-08.txt","severity":"WARNING","lineNumber":50,"column":3,"offset":825,"length":135,"message":"extension, version is missing"}

但是 m find() 仅循环一次，很好地打印第一个结果，然后结束，我不明白为什么。当我通过正则表达式匹配器运行它时，它发现所有结果都很好。我是否需要做一些事情来匹配每个结果并循环它？

Answer 1

您可以使用 (\\{.*?}) 使您的正则表达式非贪婪

删除不需要的组

Pattern p = Pattern.compile("\\{.*?}");
Matcher m = p.matcher(validatePage);
while (m.find()) {
    JSONObject jsonObj = new JSONObject(m.group());
    System.out.println(jsonObj);
}