1.點(diǎn)符號(hào).(匹配任意一個(gè)字符,且只有一個(gè)字符 )
測試環(huán)境:
I am oldboy teacher!
I teach linux.
I like badminton ball ,billiard ball and chinese chess!
my blog is http://oldboy.blog.51cto.com
our site is http://www.etiantian.org
my qq num is 49000448.
not 4900000448.
my god ,i am not oldbey,but OLDBOY!
grep "." ~/oldboy_test.txt
I am oldboy teacher!
? ? ? I teach linux.
? ? ? I like badminton ball ,billiard ball and chinese chess!
? ? ? my blog is http://oldboy.blog.51cto.com
? ? ? our site is http://www.etiantian.org
? ? ? my qq num is 49000448.
? ? ? not 4900000448.
? ? ? my god ,i am not oldbey,but OLDBOY!
顯示匹配過程:
? ? ? [root@oldboyedu ~]# grep "." ~/oldboy_test.txt? -o
? ? ? I
? ? ? a
? ? ? m
? ? ? o
? ? ? l
? ? ? d
2.星符號(hào)*
匹配前一個(gè)字符連續(xù)出現(xiàn)了0次或者多次
[root@oldboyedu ~]# grep "0*" ~/oldboy_test.txt
? ? ? I am oldboy teacher!
? ? ? I teach linux.
? ? ? I like badminton ball ,billiard ball and chinese chess!
? ? ? my blog is http://oldboy.blog.51cto.com
? ? ? our site is http://www.etiantian.org
? ? ? my qq num is 49000448.
? ? ? not 4900000448.
? ? ? my god ,i am not oldbey,but OLDBOY!
3.點(diǎn)和星結(jié)合（匹配任意所有信息 類似于通配符*）
[root@oldboyedu ~]# grep "^m.*m$" ~/oldboy_test.txt 以m開頭 m結(jié)尾 中間內(nèi)容不管的所有匹配
指定具體信息阻止貪婪匹配
? ? ? [root@oldboyedu ~]# grep "^m.*to" ~/oldboy_test.txt
4.轉(zhuǎn)義字符
echo -e "oldboy01\noldboy02\noldboy03" // -e 拓展識(shí)別 不加識(shí)別不了\n
5.中括號(hào)[]
匹配多個(gè)字符信息
grep "oldb[oe]y" oldboy_test.txt??
將以I開頭和m開頭的行都找出來
grep "^[lm]" oldboy_test.txt
6. 括號(hào)和尖號(hào)組合 [^]
排除符號(hào)
grep "^[^abc]" oldboy_test.txt //找出不是a b c 開頭的
