regex：在npp中选择多行[已关闭]

wkftcu5l 于 2023-03-20 发布在其他

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更新：我找到了解决方案的正则表达式。“（？s）信息：初始流量。？ID 123。？信息：Init flow”就可以了！

我有一个日志文件，其结构如下：

20:43:36.452 [18856] [1] start trace line 1
20:43:36.455 [18856] [1] start trace line 2
20:43:36.569 [18856] [1] start trace line 3
20:44:01.749 [18856] [1] INFO : Init flow
20:44:01.764 [18856] [1] DEBUG: line 
20:44:01.860 [18856] [1] DEBUG: line 
20:44:01.861 [18856] [1] DEBUG: ID123
20:44:01.864 [18856] [1] DEBUG: line
20:44:02.009 [18856] [1] DEBUG: line
20:44:31.969 [18856] [1] INFO : Init flow
20:44:31.974 [18856] [1] DEBUG: line 
20:44:31.975 [18856] [1] DEBUG: line 
20:44:32.029 [18856] [1] DEBUG: ID456
20:44:32.030 [18856] [1] DEBUG: line
20:44:32.039 [18856] [1] DEBUG: line
20:44:32.109 [18856] [1] INFO : Init flow
20:44:32.109 [18856] [1] DEBUG: line 
20:44:32.109 [18856] [1] DEBUG: line 
20:44:32.179 [18856] [1] DEBUG: ID789
20:44:32.179 [18856] [1] DEBUG: line
20:44:32.179 [18856] [1] DEBUG: line
20:44:32.289 [18856] [1] INFO : Init flow

是否可以从行“INFO：初始化流”，通过ID到“INFO：初始流量”？
例如，如果我在ID 123上搜索，我希望选择以下行：

20:44:01.749 [18856] [1] INFO : Init flow
20:44:01.764 [18856] [1] DEBUG: line 
20:44:01.860 [18856] [1] DEBUG: line 
20:44:01.861 [18856] [1] DEBUG: ID123
20:44:01.864 [18856] [1] DEBUG: line
20:44:02.009 [18856] [1] DEBUG: line
20:44:31.969 [18856] [1] INFO : Init flow

我尝试了多个regex示例和网站https://regex101.com/
我对惰性搜索（向后看和向前看）感到困惑。

regex

来源：https://stackoverflow.com/questions/75750041/regex-select-multiple-lines-in-npp

2条答案

按热度按时间

huus2vyu1#

如果您保证只需要前面和后面各2行，则可以使用Grep：

grep -A2 -B2 'ID123' <file>

然而，如果你需要做更多的逻辑，我不推荐使用多行正则表达式或文本编辑器，相反，我推荐使用日志解析器。

my $target = shift; # grab the first command line argument as the target ID
                    # protip: supports regex symantics so ID12[34] would get ID123 and ID124
my @lines = (); # buffer
my $print = false; # set to true if you want to print the target buffer
while (<>) { # read all input line by line into $_
    if /Init Flow/ {
        print @lines if $print;  # print the buffer with target content
        @lines = (); # flush lines
        $print = false; # printed; look for next target
    }
    if /$target/ {
        $print = true; # we found our target
    }
    push(@lines, $_); # add the current line to the buffer
}

可以通过在命令行上提供目标来运行此示例：