多发发一些有意思的题做做呀！[+sed/awk/regex练习]

jiazhengw

Post by johnny_jiang

关于第5个小题,网络地址应该为9.80.0.0,按照要求是不是需要匹配如下的几段:
1. 9.80.1.15 ~ 9.80.255.255
2. 9.81.0.0   ~ 9.81.255.255
3. 9.82.0.0   ~ 9.82.255.255
4. 9.83.0.0   ~ 9.83.253.100

我的这题考虑得太少了！现在看来，好多还得重做。！

yongjian

Post by jiazhengw
是的，我是从个位判断的，个位如果是0，则十位可以是[1-9],依此类推。如果从十位判断也可以，十位如果是9，则个位可以是[0-8],这样也可以。我觉得用这样的方法那如果是三位数那岂不是长得将人看晕了，呵呵！总觉得有简单的方法，但想不出。

yeah, its basically a factorial formula

jiazhengw

大家最后一题有没有做出来的。我做了好多次，用egrep 就是出不了正确的结果。也不知是为什么，不过发现一个小东东：如果单独的＜出现的话，可以不用转义，如果和\同时出现的话，就要转义，即：匹配\<,要用\\\<。

yongjian

No many people are interested in those exams looks like... well here is what I did for the IP one:

1. 
   
2. 1.
   
3. /(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){3}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))$/
   
4. 
   
5. 2.
   
6. A class:
   
7. ([1-9][0-9]?|1[0-2][0-7])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
   
8. 
   
9. 3.
   
10. B class:
    
11. 1(2[89]|[3-8][0-9]|9[01])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
    
12. 
    
13. 4.
    
14. C class:
    
15. 19[2-9]|2([01][0-9]|2[0-3])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
    
16. 
    
17. 5.
    
18. 9.80.1.15 - 9.83.253.100 的所有IP表达式（netmask = 255.252.0.0）
    
19. 9\.8(0\.(1\.(1[5-9]|[2-9][0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))|([2-9]|[1-9][0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))))|[12](\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))){2}|3\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-2]))\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))|253\.([1-9]?[0-9]|100)))
    

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Please check...

johnny_jiang

Post by yongjian
No many people are interested in those exams looks like... well here is what I did for the IP one:

1. 
   
2. 1.
   
3. /(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){3}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))$/
   
4. [color=green]passed[/color]
   
5. 
   
6. 2.
   
7. A class:
   
8. ([1-9][0-9]?|1[0-2][0-7])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
   
9. [color=red]
   
10. echo 1.0.00.254 | egrep 'regexp'          echo back
    
11. echo 192.168.0.1 | egrep 'regexp'        echo back
    
12. not passed
    
13. [/color]
    
14. 
    
15. 3.
    
16. B class:
    
17. 1(2[89]|[3-8][0-9]|9[01])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
    
18. [color=red]
    
19. echo 128.0.00.1 | egrep 'regexp'         echo back
    
20. not passed
    
21. [/color]
    
22. 
    
23. 4.
    
24. C class:
    
25. 19[2-9]|2([01][0-9]|2[0-3])\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){2}([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))
    
26. [color=red]
    
27. also 00 problem
    
28. not passed
    
29. [/color]
    
30. 
    
31. 5.
    
32. 9.80.1.15 - 9.83.253.100 的所有IP表达式（netmask = 255.252.0.0）
    
33. 9\.8(0\.(1\.(1[5-9]|[2-9][0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))|([2-9]|[1-9][0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5])\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))))|[12](\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))){2}|3\.(([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-2]))\.([1-9]?[0-9]|1[0-9]{2}|2([0-4][0-9]|5[0-5]))|253\.([1-9]?[0-9]|100)))
    
34. [color=red]
    
35. echo 9.81.0.256 | egrep 'regexp'            echo back
    
36. not passed
    
37. [/color]
    

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yongjian兄，我不确定我在测试中有没有key错，我感觉好像是我搞错了，请大家帮忙测试一下吧。

yongjian

May have problems in there... I hated numbers after I've done them... See if anyone can find out.

yongjian

This is how I did for the last special char matching.

1. '[^\]*\\"t\\"[^\]*\\<user@domain\.com\\>[^\]*\\"b\\"\.'
   
2. An easy one is like '\([^\]*\\\)*"\.'
   

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jiazhengw

Post by yongjian
This is how I did for the last special char matching.

1. '[^\]*\\"t\\"[^\]*\\<user@domain\.com\\>[^\]*\\"b\\"\.'
   
2. An easy one is like '\([^\]*\\\)*"\.'
   

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怎么yongjian兄的这个正则我看不懂呀，其中的　[^\]　是什么意思？除了反斜杠都匹配吗？那就不仅仅匹配字符with和and，还有很多东东了，是不是我题意理解错了？请yongjian版主指点。

yongjian

ya, [^\]* means match anything not \, but it ends at the next closest \, so [^\]*\\ only match "with ".

jiazhengw

哦，原来是这样的啊，I see，多谢！