忽略大小寫切換和尖不與預期

this is some words 
and this one too<div> 
<html></html> 
and more words 123 
Caps to begin 
ASDFSDFSDF

以下兩個命令工作，我期望：

grep -i '[:alpha:]' testfile

給

this is some words 
and this one too<div> 
<html></html> 
and more words 123 
Caps to begin 
ASDFSDFSDF

and

grep '[:alpha:]' testfile

給

this is some words 
and this one too<div> 
<html></html> 
and more words 123 
Caps to begin

但

grep '^[:alpha:]' testfile 

and this one too<div> 
and more words 123

和

grep -i '^[:alpha:]' testfile 

and this one too<div> 
and more words 123 
ASDFSDFSDF

應確保線路開始以字母數字已經一切都搞砸了插入符號。爲什麼'這是一些字'的行和'帽開始'行不匹配？這是在Mac Lion上使用bash。

2011-08-10 Brynjar

我相信你要找的是什麼：

grep '^[[:alpha:]]' testfile 
grep -i '^[[:alpha:]]' testfile

2011-08-10 22:27:38

是啊。我混淆了語法'[[：alpha：]]'和''[a-z]''。 Grep和疲倦混合不好 – Brynjar

回答