正则表达式练习

正则表达式练习

2013年3月8日 星期五 晴 有风

正则表达式练习

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

apple is my favorite food.

Football game is not use feet only.

this dress doesn't fit me.

However, this dress is about $ 3183 dollars.

GNU is free air not free beer.

Her hair is very beauty.

I can't finish the test.

Oh! The soup taste good.

motorcycle is cheap than car.

This window is clear.

the symbol '*' is represented as start.

Oh!    My god!

The gd software is a library for drafting programs.

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

The world is the same with "glad".

I like dog.

google is the best tools for search keyword.

goooooogle yes!

go! go! Let's go.

# I am VBird

1、过滤-文件中包含 the 关键字

2、过滤-文件中丌包含 the 关键字

3、过滤-文件中丌论大小写 the 关键字

4、过滤 test 或 taste 这两个单字

5、过滤有 oo 的字节

6、过滤丌想要 oo 前面有 g 的

7、过滤 oo 前面丌想有小写字节

8、过滤有数字的那一行

9、过滤以 the 开头的

10、过滤以小写字母开头的

11、过滤开头丌是英文字母

12、过滤行尾结束为小数点.那一行

13、过滤空白行

14、过滤出 g??d 的字串

15、过滤至少两个 o 以上的字串

16、过滤 g 开头和 g 结尾但是两个 g 之间仅存在至少一个 o

17、过滤任意数字的行

18、过滤两个 o 的字串

19、过滤 g 后面接 2 到 5 个 o，然后在接一个 g 的字串

20、过滤 g 后面接 2 个以上 o 的

所给答案

[root@desktop1 ~]# grep -n 'the' regular_express.txt

[root@desktop1 ~]# grep -vn 'the' regular_express.txt

[root@desktop1 ~]# grep -in 'the' regular_express.txt

[root@desktop1 ~]# grep -n 't[ae]st' regular_express.txt

[root@desktop1 ~]# grep -n 'oo' regular_express.txt

[root@desktop1 ~]# grep -n '[^g]oo' regular_express.txt

[root@desktop1 ~]# grep -n '[^a-z]oo' regular_express.txt

[root@desktop1 ~]# grep -n '[^[:lower:]]oo' regular_express.txt

[root@desktop1 ~]# grep -n '[0-9]' regular_express.txt

[root@desktop1 ~]# grep -n '[[:digit:]]' regular_express.txt

[root@desktop1 ~]# grep -n '^the' regular_express.txt

[root@desktop1 ~]# grep -n '^[a-z]' regular_express.txt

[root@desktop1 ~]# grep -n '^[[:lower:]]' regular_express.txt

[root@desktop1 ~]# grep -n '^[^a-zA-Z]' regular_express.txt

[root@desktop1 ~]# grep -n '^[^[:alpha:]]' regular_express.txt

[root@desktop1 ~]# grep -n '\.$' regular_express.txt

[root@desktop1 ~]# grep -n '^$' regular_express.txt

[root@desktop1 ~]# grep -n 'g..d' regular_express.txt

[root@desktop1 ~]# grep -n 'ooo*' regular_express.txt

[root@desktop1 ~]# grep -n 'goo*g' regular_express.txt

[root@desktop1 ~]# grep -n 'goo*g' regular_express.txt

[root@desktop1 ~]# grep -n '[0-9][0-9]*' regular_express.txt

[root@desktop1 ~]# grep -n 'o\{2\}' regular_express.txt

[root@desktop1 ~]# grep -n 'go\{2,5\}g' regular_express.txt

[root@desktop1 ~]# grep -n 'go\{2,\}g' regular_express.txt

练习情况

1、过滤-文件中包含 the 关键字

[root@desktop7 Desktop]# grep -n "the" regular_express.txt --color

8:I can't finish the test.

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

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

16:The world is the same with "glad".

18:google is the best tools for search keyword.

[root@desktop7 Desktop]#

2、过滤-文件中不包含 the 关键字

[root@desktop7 Desktop]# grep -vn "the" regular_express.txt --color

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.

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

6:GNU is free air not free beer.

7:Her hair is very beauty.

9:Oh! The soup taste good.

10:motorcycle is cheap than car.

11:This window is clear.

13:Oh!  My god!

14:The gd software is a library for drafting programs.

17:I like dog.

19:goooooogle yes!

20:go! go! Let's go.

21:# I am VBird

22:

[root@desktop7 Desktop]#

3、过滤-文件中不论大小写 the 关键字

[root@desktop7 Desktop]# grep -in "the" regular_express.txt --color

8:I can't finish the test.

9:Oh! The soup taste good.

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

14:The gd software is a library for drafting programs.

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

16:The world is the same with "glad".

18:google is the best tools for search keyword.

[root@desktop7 Desktop]#

4、过滤 test 或 taste 这两个单字

[root@desktop7 Desktop]# grep -n "t[ea]st" regular_express.txt --color

8:I can't finish the test.

9:Oh! The soup taste good.

[root@desktop7 Desktop]#

5、过滤有 oo 的字节

[root@desktop7 Desktop]# grep -n "ooo*" regular_express.txt --color

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!

[root@desktop7 Desktop]#

6、过滤不想要 oo 前面有 g 的

[root@desktop7 Desktop]# grep -n '[^g]oo' regular_express.txt --color

2:apple is my favorite food.

3:Football game is not use feet only.

18:google is the best tools for search keyword.

19:goooooogle yes!

[root@desktop7 Desktop]#

7、过滤 oo 前面不想有小写字节

[root@desktop7 Desktop]# grep -n '[^[:lower:]]oo' regular_express.txt --color

3:Football game is not use feet only.

过滤 oo 前面不想有数字

[root@desktop7 Desktop]# grep -n '[^[:digit:]]oo' regular_express.txt --color

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!

[root@desktop7 Desktop]#

8、过滤有数字的那一行

[root@desktop7 Desktop]# grep -n "[[:digit:]]" regular_express.txt --color

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

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

[root@desktop7 Desktop]#

9、过滤以 the 开头的

[root@desktop7 Desktop]# grep -n "^the" regular_express.txt --color 12:the symbol '*' is represented as start.

[root@desktop7 Desktop]#

10、过滤以小写字母开头的

[root@desktop7 Desktop]# grep -n "^[[:lower:]]" regular_express.txt --color

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.

[root@desktop7 Desktop]#

11、过滤开头不是英文字母

[root@desktop7 Desktop]# grep -vn "^[[:alpha:]]" regular_express.txt --color

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

21:# I am VBird

22:

检验：反向查找

[root@desktop7 Desktop]# grep -n "^[[:alpha:]]" regular_express.txt --color

2:apple is my favorite food.

3:Football game is not use feet only.

4:this dress doesn't fit me.

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

6:GNU is free air not free beer.

7:Her hair is very beauty.

8:I can't finish the test.

9:Oh! The soup taste good.

10:motorcycle is cheap than car.

11:This window is clear.

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

13:Oh!  My god!

14:The gd software is a library for drafting programs.

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

16:The world is the same with "glad".

17:I like dog.

18:google is the best tools for search keyword.

19:goooooogle yes!

20:go! go! Let's go.

[root@desktop7 Desktop]#

12、过滤行尾结束为小数点.那一行

[root@desktop7 Desktop]# dos2unix regular_express.txt

dos2unix: converting file regular_express.txt to UNIX format ...

[root@desktop7 Desktop]# grep -n '\.$' regular_express.txt --color 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.

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

6:GNU is free air not free beer.

7:Her hair is very beauty.

8:I can't finish the test.

9:Oh! The soup taste good.

10:motorcycle is cheap than car.

11:This window is clear.

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

14:The gd software is a library for drafting programs.

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

16:The world is the same with "glad".

17:I like dog.

18:google is the best tools for search keyword.

20:go! go! Let's go.

[root@desktop7 Desktop]#

13、过滤空白行

[root@desktop7 Desktop]# dos2unix regular_express.txt

dos2unix: converting file regular_express.txt to UNIX format ...

[root@desktop7 Desktop]# grep -n '^$' regular_express.txt --color

22:

[root@desktop7 Desktop]#

14、过滤出 g??d 的字串

[root@desktop7 Desktop]# grep -n 'g??d' regular_express.txt --color

无

[root@desktop7 Desktop]# grep -n 'g..d' regular_express.txt --color

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

9:Oh! The soup taste good.

16:The world is the same with "glad".

[root@desktop7 Desktop]#

15、过滤至少两个 o 以上的字串

第一种方式

[root@desktop7 Desktop]# grep -n 'ooo*' regular_express.txt --color

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!

[root@desktop7 Desktop]#

第二种方式

[root@desktop7 Desktop]# grep -n 'o\{2,\}' regular_express.txt --color

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!

[root@desktop7 Desktop]#

16、过滤 g 开头和 g 结尾但是两个 g 之间仅存在至少一个 o

[root@desktop7 Desktop]# grep -n 'goo*g' regular_express.txt --color

18:google is the best tools for search keyword.

19:goooooogle yes!

[root@desktop7 Desktop]#

17、过滤任意数字的行

[root@desktop7 Desktop]# grep -n '[[:digit:]]' regular_express.txt --color

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

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

[root@desktop7 Desktop]#

18、过滤两个 o 的字串

方法一：

[root@desktop7 Desktop]# grep -n 'oo' regular_express.txt --color

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!

[root@desktop7 Desktop]#

方法二：

[root@desktop7 Desktop]# grep -n 'o\{2\}' regular_express.txt --color

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!

[root@desktop7 Desktop]#

19、过滤 g 后面接 2 到 5 个 o，然后再接一个 g 的字串

[root@desktop7 Desktop]# grep -n 'go\{2,5\}g' regular_express.txt --color

18:google is the best tools for search keyword.

[root@desktop7 Desktop]#

20、过滤 g 后面接 2 个以上 o 的

方法一：

[root@desktop7 Desktop]# grep -n 'go\{2,\}' regular_express.txt --color

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

9:Oh! The soup taste good.

18:google is the best tools for search keyword.

19:goooooogle yes!

方法二：

[root@desktop7 Desktop]# grep -n 'gooo*' regular_express.txt --color

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

9:Oh! The soup taste good.

18:google is the best tools for search keyword.

19:goooooogle yes!

[root@desktop7 Desktop]#

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