查找非小写字母加oo的内容

　　[root@ www.linuxidc.com]# grep -n '[^a-z]oo' regular_express.txt

　　3:Football game is not use feet only.

　　获取有数字的一行

　　[root@ www.linuxidc.com]# grep -n '[0-9]' regular_express.txt

　　5:However, this dress is about $ 3183 dollars.

　　15:You are the best is mean you are the no. 1.

　　[root@ www.linuxidc.com]# grep -n '[^[:lower:]]oo' regular_express.txt

　　3:Football game is not use feet only.

　　查询以the开头的字符

　　[root@ www.linuxidc.com]# grep -n '^the' regular_express.txt

　　12:the symbol '*' is represented as start.

　　查询开头是小写字母的内容

　　[root@ www.linuxidc.com]# grep -n '^[a-z]' regular_express.txt

　　2:apple is my favorite food.

　　4:this dress doesn't fit me.

　　10:motorcycle is cheap than car.

　　12:the symbol '*' is represented as start.

　　18:google is the best tools for search keyword.

　　19:goooooogle yes!

　　20:go! go! Let's go.

　　查询第一个字符不是大写的

　　[root@ www.linuxidc.com]# grep -n '^[[:lower:]]' regular_express.txt

　　2:apple is my favorite food.

　　4:this dress doesn't fit me.

　　10:motorcycle is cheap than car.

　　12:the symbol '*' is represented as start.

　　18:google is the best tools for search keyword.

　　19:goooooogle yes!

　　20:go! go! Let's go.

　　查询不是以英文开头的字符

　　[root@ www.linuxidc.com]# grep -n '^[^a-zA-Z]' regular_express.txt

　　1:"Open Source" is a good mechanism to develop programs.

　　21:# I am VBird

　　查询结尾是小数点的行的内容.

　　[root@ www.linuxidc.com]# grep -n '\.$' regular_express.txt

　　1:"Open Source" is a good mechanism to develop programs.

　　2:apple is my favorite food.

　　3:Football game is not use feet only.

　　4:this dress doesn't fit me.

　　10:motorcycle is cheap than car.

　　11:This window is clear.

　　12:the symbol '*' is represented as start.

　　15:You are the best is mean you are the no. 1.

　　16:The world <Happy> is the same with "glad".

　　17:I like dog.

　　18:google is the best tools for search keyword.

　　20:go! go! Let's go.

　　查找“空白行”

　　[root@ www.linuxidc.com]# grep -n '^$' regular_express.txt

　　22:

　　通配符.和*的使用，.(小数点)代表一定有一个任意字符，*代表重复前一个到无穷多次的意思

　　[root@ www.linuxidc.com]# grep -n 'g..d' regular_express.txt

　　1:"Open Source" is a good mechanism to develop programs.

　　9:Oh! The soup taste good.

　　16:The world <Happy> is the same with "glad".

　　查询出现任意数字的行列

　　[root@ www.linuxidc.com]# grep -n '[0-9][0-9]*' regular_express.txt

　　5:However, this dress is about $ 3183 dollars.

　　15:You are the best is mean you are the no. 1.

　　查询出现两个o的字符串

　　[root@ www.linuxidc.com]# grep -n 'o\{2\}' regular_express.txt

　　1:"Open Source" is a good mechanism to develop programs.

　　2:apple is my favorite food.

　　3:Football game is not use feet only.

　　9:Oh! The soup taste good.

　　18:google is the best tools for search keyword.

　　19:goooooogle yes!

　　查询出现2-5个o的字符串,后面在接一个g的字符串

　　[root@ www.linuxidc.com]# grep -n 'o\{2,5\}g' regular_express.txt

　　18:google is the best tools for search keyword.

　　19:goooooogle yes!

　　查询出现2个以上o的字符串,后面在接一个g的字符串

　　[root@ www.linuxidc.com]# grep -n 'o\{2,\}g' regular_express.txt

　　18:google is the best tools for search keyword.

　　19:goooooogle yes!

　　三、扩展资料：linux中grep命令之正则表达式

　　匹配字符：这部分和基本正则表达式一样

　　匹配次数：

　　* ：和基本正则表达式一样

　　? ：基本正则表达式是\?，二这里没有\。

　　{m,n} ：相比基本正则表达式也是没有了\。

　　+ ：匹配其前面的字符至少一次，相当于{1,}。

　　位置锚定：和基本正则表达式一样。

　　分组及引用：

　　(string) ：相比基本正则表达式也是没有了\。

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