grep +与正则表达式完全匹配IP地址 [英] grep + match exactly IP address with Regular Expression

问题描述

我的目标是准确匹配三个字节的IP地址，而四个IP八位字节必须是有效八位字节 - <0到255>之间

例如I

  $ more文件
 192.9.200.10 
 192.9.200.100 
 192.9.200.1555 
 192.9.200.1 
 192.9.200.aaa 
 192.9.200。@ 
 192.9.200 .: 
 192.9.200 
 192.9 0.200。 
  

我需要匹配前三个八位组 - 192.9.200，而四个八位组必须有效（0- 255）

最后 - 预期结果应该是：

  192.9 .200.10 
 192.9.200.100 
 192.9.200.1 
  

基本语法应该是如下所示：

  IP_ADDRESS_THREE_OCTETS = 192.9.200 
 cat file | grep -x $ IP_ADDRESS_THREE_OCTETS。[grep Regular Expression syntax] 
  

请教如何编写正确的 grep正则表达式在四个八位字节中，以匹配三个八位字节，而四个八位字节必须是有效的？ 解析方案

您需要使用一些高级工具将文本转换为正则表达式模式，因此您可以使用它。

  perl -ne'
 BEGIN {$ base = shift（@ARGV）; } 
如果/^\Q$base\E\.([0-9]+)$/&&& 0< = $ 1&& $ 1< = 255; 
'$ IP_ADDRESS_THREE_OCTETS文件
  

如果硬编码基数可以接受，

  perl -ne'print if /^192\.9\.200\.([0-9] +）$ /&& 0< = $ 1&& $ 1< = 255'文件
  

这两个片段也接受来自STDIN的输入。

---

完整的IP地址：

  perl -ne'
 BEGIN {$ ip = shift（@ARGV）; } 
打印如果/ ^ \ Q $ ip \ $ $; 
'1.2.3.4档案
  

或

  perl -nle'
 BEGIN {$ ip = shift（@ARGV）; } 
打印如果$ _ eq $ ip; 
'1.2.3.4档案
  

my target is to match exactly IP address with three octes , while the four IP octet must be valid octet - between <0 to 255>

For example I have the following IP's in file

$ more file    
192.9.200.10
192.9.200.100
192.9.200.1555
192.9.200.1
192.9.200.aaa
192.9.200.@
192.9.200.:
192.9.200
192.9.200.

I need to match the first three octets - 192.9.200 while four octet must be valid ( 0-255)

so finally - expects result should be:

192.9.200.10
192.9.200.100
192.9.200.1

the basic syntax should be as the following:

IP_ADDRESS_THREE_OCTETS=192.9.200
cat file | grep -x $IP_ADDRESS_THREE_OCTETS.[  grep‏ Regular Expression syntax ]

Please advice how to write the right "grep regular Expression" in the four octets in order to match the three octets , while the four octets must be valid?

解决方案

You'd need to use some high-level tools to convert the text to a regex pattern, so you might as well use just that.

perl -ne'
    BEGIN { $base = shift(@ARGV); }
    print if /^\Q$base\E\.([0-9]+)$/ && 0 <= $1 && $1 <= 255;
' "$IP_ADDRESS_THREE_OCTETS" file

If hardcoding the base is acceptable, that reduces to:

perl -ne'print if /^192\.9\.200\.([0-9]+)$/ && 0 <= $1 && $1 <= 255' file

Both of these snippets also accept input from STDIN.

---

For a full IP address:

perl -ne'
    BEGIN { $ip = shift(@ARGV); }
    print if /^\Q$ip\E$/;
' 1.2.3.4 file

or

perl -nle'
    BEGIN { $ip = shift(@ARGV); }
    print if $_ eq $ip;
' 1.2.3.4 file

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