Java中提取所有带有描述的WARN消息所需的REGEX可能是也可能不是多行消息

Question

我正在尝试为输入文本编写一个正则表达式，其中我必须提取所有带有前面消息的WARN代码。通常，警告可以是多行的，也可以不是多行的，如下所示。

[C] L1250 WARN  k2 bw34 Flex - Sockets:<16>, ThreadsPerCore:<1>
[C] L1250 WARN  For abcd (analytical and transactional workloads). For 12s Systems and above, should be
                disabled.
[C] L1250 INFO  For abcd (analytical workloads), Hyperthreading should be enabled , 8s, 12s, 14d, 34t
                d above.
[C] L1250 WARN  Intel's Hyperthreading on 18+ Socket system disabled. Should be disabled urgently
                fix it!
[C] L1300 OK    CPU governors set as recommended
[C] L1250 WARN  Intel's Hyperthreading on 8+ Socket system disabled.

最初，我从regex：( WARN ).*(\b|\B)开始，它捕获到单词/非单词边界的结尾，它不会捕获后面的多行(继续WARN描述)。

然后我尝试了-> WARN.+(\S\s*?)+(?=[C])，但这并没有捕获最后一个警告行，因为没有更多的C标记。

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Answer 1

您可以在不使用[\s\S]*或单行选项的情况下通过匹配所有不是以[C]开头的行来获取匹配项

\bWARN\h+.*(?:\R(?!\[C]).*)*

说明

unicode匹配警告，前面有一个单词边界以防止成为更大的unicode匹配unicode空格chars

• (?:非捕获组
• \R(?!\[C]).*匹配unicode换行符序列的一部分，断言该字符串不是以[C]

开始的。

​

• )* Close组和repeat 0+ times

Regex demo | Java demo

例如：

String regex = "\\bWARN\\h+.*(?:\\R(?!\\[C]).*)*";
String string = "[C] L1250 WARN  k2 bw34 Flex - Sockets:<16>, ThreadsPerCore:<1>\n"
     + "[C] L1250 WARN  For abcd (analytical and transactional workloads). For 12s Systems and above, should be\n"
     + "                disabled.\n"
     + "[C] L1250 INFO  For abcd (analytical workloads), Hyperthreading should be enabled , 8s, 12s, 14d, 34t\n"
     + "                d above.\n"
     + "[C] L1250 WARN  Intel's Hyperthreading on 18+ Socket system disabled. Should be disabled urgently\n"
     + "                fix it!\n"
     + "[C] L1300 OK    CPU governors set as recommended\n"
     + "[C] L1250 WARN  Intel's Hyperthreading on 8+ Socket system disabled.";

Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
Matcher matcher = pattern.matcher(string);

while (matcher.find()) {
    System.out.println(matcher.group(0));
}

输出

WARN  k2 bw34 Flex - Sockets:<16>, ThreadsPerCore:<1>
WARN  For abcd (analytical and transactional workloads). For 12s Systems and above, should be
                disabled.
WARN  Intel's Hyperthreading on 18+ Socket system disabled. Should be disabled urgently
                fix it!
WARN  Intel's Hyperthreading on 8+ Socket system disabled.

如果[C]不是边界，则另一个选项是检查下一行是否不包含WARN、INFO或OK之一

 \bWARN\h+.*(?:\R(?!.*\h(?:WARN|INFO|OK)\h).*)*

Regex demo

在Java中

String regex = "\\bWARN\\h+.*(?:\\R(?!.*\\h(?:WARN|INFO|OK)\\h).*)*";

Answer 2

使用选项全局和单行尝试这个正则表达式：WARN.*?(?=\[C\]|$)

这将查找从WARN开始直到下一个'C‘或输入字符串结尾的所有内容。

演示：https://regex101.com/r/KZXWwL/1