Shell三剑客：正则表达式(元字符)——示例

浅∶）笑2023-12-21 14:20

grep love 1.txt
/^love/
/love$/
/l.ve/
/lo*ve/
/[Ll]ove/
/love[a-z]/
/love[^a-zA-Z0-9]
/.*/
/^$/
/^[A-Z]..$"/
/^[A-Z][a-z]*3[0-5]/
/[a-z]*\."/
/^*[A-Z][a-z][a-z]$"/
/^*[A-Za-z]*[^,][A-Za-z]*$/
/\<fourth\>/
/\<f.*th\> /
/5{2}2{3}\./
/^[\t]*$/
/^#/
/^[\t]*#/
:1,$ s/$[Oo]ccur$ence/\1rence/
:1,$ s /$square$ and $fair$/\2 and \1/

cs 复制代码

[root@localhost ~]# grep "^$" 1.txt 
[root@localhost ~]# grep ".*" 1.txt 
#qian
#yoa
#huang
kai
kong
cai
[root@localhost ~]# grep "^$" 1.txt 
[root@localhost ~]# grep "[A-Z]..$" 1.txt 
[root@localhost ~]# grep "[^A-Z]..$" 1.txt 
#qian
#yoa
#huang
kai
kong
cai
duo
[root@localhost ~]# grep "^[A-Z]..$" 1.txt 
[root@localhost ~]# grep "^[A-Z][a-z]*3[0-5]" 1.txt 
[root@localhost ~]# grep "[a-z]*\." 1.txt 
l.ve
[root@localhost ~]# grep "^*[A-Z][a-z][a-z]$" 1.txt 
[root@localhost ~]# grep "^*[A-Za-z]*[^,][A-Za-z]*$" 1.txt 
[root@localhost ~]# grep "\<fourth\>" 1.txt 
[root@localhost ~]# grep \<fourth\> 1.txt 
[root@localhost ~]# grep \<f.*th\> 1.txt 
[root@localhost ~]# grep "5{2}2{3}\." 1.txt 
[root@localhost ~]# grep "^[\t]*$" 1.txt 
[root@localhost ~]# grep "^#" 1.txt 
#qian
#yoa
#huang
[root@localhost ~]# grep "^[\t]*#" 1.txt 
#qian
#yoa
#huang
:1,$ s/\([Oo]ccur\)ence/\1rence/ 
:1,$ s /\(square\) and \(fair\)/\2 and \1/