how to judge wether a url is valid or not using awk

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# 1  
Old 05-10-2010
Question how to judge wether a url is valid or not using awk

# 2  
Old 05-10-2010
So how do you define a valid url?
# 3  
Old 05-10-2010
i am using a c++ html parser to extracr links from the web pages.
but there are many abnormal url in the results.
fro exampel:

---------- Post updated at 11:41 AM ---------- Previous update was at 11:40 AM ----------

i am using a c++ html parser to extracr links from the web pages.
but there are many abnormal urls in the results.
for example:
# 4  
Old 05-10-2010
In your first example, there are non-ASCII code in url, you will think it is not valid url, or there should not have two http in one url?

in your second example, there is no . in first // / sesson?

Are the only roles for your request?
# 5  
Old 05-10-2010
yes, can you give me any idea .
# 6  
Old 05-10-2010
$ cat urfile

$ grep -E -iv "http.*http|\/\/[0-9a-z]*\/" urfile

# 7  
Old 05-10-2010
awk '{if ($0 ~ /^http:\/\/www*/) { print $0 ,"valid" } else { print $0 ,"invalid" }}' abc.txt valid invalid
http://123/a.html invalid
http://..: invalid invalid

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