Question

输入：

This script may take a while to run, especially on a busy podmaster.
Generating Syslog TopN list on node for last 3 hours.

        Top 5 hosts for Day: Oct8 between 02:00:00 and 02:59:59
            Rank       Number of Alerts Host
            ----       ---------------- ----
        1       3124        aaa.ab.com
        2       2294        bbb
        3       2157        ccc
        4       832     ddd
        5       816     eee

Top 5 hosts for Day: Oct8 between 01:00:00 and 01:59:59
        Rank       Number of Alerts Host
        ----       ---------------- ----
        1       5495        fff
        2       2625        ggg
        3       998     hhh
        4       752     iii
        5       741     jjj

Top 5 hosts for Day: Oct8 between 00:00:00 and 00:59:59
        Rank       Number of Alerts Host
        ----       ---------------- ----
        1       2747        kkk
        2       876     lll
        3       780     mmm
        4       724     nnn
        5       309     ooo

我使用下面的正则表达式来匹配这种格式。

\s+1+\s+([\d]+)\s+([\w]+)[\S\s]*?\s+1+\s+([\d]+)\s+([\w]+)[\S\s]*?\s+1+\s+([\d]+)\s+([\w]+)

上面表达式的输出是

$2 = aaa.ab.com
$4 = fff
$5 = kkk

但是我需要正则表达式来分别匹配排名1。

Example output:
$2 = aaa.ab.com 
$4 = fff
$5 = kkk

我们必须写一个正则表达式来匹配ab.com和ab.com不存在的情况。请帮我解决一下。

Answer 1

\s+1+\s+([\d]+)\s+((?:\w+)(?:[\.]ab[\.]com)?)[\S\s]*?\s+1+\s+([\d]+)\s+((?:\w+)(?:[\.]ab[\.]com)?)[\S\s]*?\s+1+\s+([\d]+)\s+((?:\w+)(?:[\.]ab[\.]com)?)

使用正则表达式获取带有点的主机名

1 个答案: