linux的正则表达式

linux的正则表达式

 

linux的正则表达式是通过grep命令来实现的，举个最简单的例子的吧

$ ps -ef | grep 'python'

这个就是从所有的进程中找出含有python的那些

再来一个

$ netstat -nlp  | grep tcp | grep '33.+?'

这个表示找到那些tcp的监听端口是33开头的，比如是332，3306，3307这样的端口。

 

下面给出正则表达式的常用语法：

Regex operator	Meaning
.	Matches any single character.
?	The preceding item is optional and will be matched, at most, once.
*	The preceding item will be matched zero or more times.
+	The preceding item will be matched one or more times.
{N}	The preceding item is matched exactly N times.
{N,}	The preceding item is matched N or more times.
{N,M}	The preceding item is matched at least N times, but not more than M times.
–	Represents the range if it's not first or last in a list or the ending point of a range in a list.
^	Matches the empty string at the beginning of a line; also represents the characters not in the range of a list.
$	Matches the empty string at the end of a line.
\b	Matches the empty string at the edge of a word.
\B	Matches the empty string provided it's not at the edge of a word.
\<	Match the empty string at the beginning of word.
\>	Match the empty string at the end of word.

 

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