linux - 如何像这样grep字符串？

Question

字符串:

4b30a444-86c9-4fb8-b5dc-ba721e30fb24    
a8e4e6a8-5655-4adc-a393-ccbb6848c9dc
cc1918be-a532-4ebe-948a-de78cc455fcb
12b6e407-4ec0-4cc6-80d4-b38d7df99694
5b153e1f-6abd-4fd9-9ce2-c7917010f3ee

我试过这些:

egrep [a-z0-9]-[a-z0-9]-[a-z0-9]-[a-z0-9]-[a-z0-9]

egrep '[a-z]{2,}-[a-z]{2,}-[a-z]{2,}-[a-z]{2,}-[a-z]{2,}'

egrep '.-.-.-.-.'

但是什么也没发生

Answer 1

将 + 用于该字符类的 1 个或多个字符，如下所示:

$ egrep '[a-z0-9]+-[a-z0-9]+-[a-z0-9]+-[a-z0-9]+-[a-z0-9]+' data 
4b30a444-86c9-4fb8-b5dc-ba721e30fb24    
a8e4e6a8-5655-4adc-a393-ccbb6848c9dc
cc1918be-a532-4ebe-948a-de78cc455fcb
12b6e407-4ec0-4cc6-80d4-b38d7df99694
5b153e1f-6abd-4fd9-9ce2-c7917010f3ee
$

或者使用像这样的量词来使用固定数量的字符:

$ egrep '[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}' data 
4b30a444-86c9-4fb8-b5dc-ba721e30fb24    
a8e4e6a8-5655-4adc-a393-ccbb6848c9dc
cc1918be-a532-4ebe-948a-de78cc455fcb
12b6e407-4ec0-4cc6-80d4-b38d7df99694
5b153e1f-6abd-4fd9-9ce2-c7917010f3ee

或者您可以使用 {2,} 来表示 2 个或更多字符，如下所示:

$ egrep '[a-z0-9]{2,}-[a-z0-9]{2,}-[a-z0-9]{2,}-[a-z0-9]{2,}-[a-z0-9]{2,}' data 
4b30a444-86c9-4fb8-b5dc-ba721e30fb24    
a8e4e6a8-5655-4adc-a393-ccbb6848c9dc
cc1918be-a532-4ebe-948a-de78cc455fcb
12b6e407-4ec0-4cc6-80d4-b38d7df99694
5b153e1f-6abd-4fd9-9ce2-c7917010f3ee