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awk equivalent of regex

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# 1  
Old 01-18-2012
awk equivalent of regex
Hi all,

Can someone tell me what's the (g)awk equal of this simple regex to find ip addresses in urls:

Code:
egrep "^http://[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(:[0-9]{1,5})?/"

Input:
Code:
http://10.0.0.1/query.exe
http://11y10x09w:80/howaboutme
http://192.168.100.190:1234/takeme.gpg

Output:
Code:
http://10.0.0.1/query.exe
http://192.168.100.190:1234/takeme.gpg

I've been breaking my head over the last couple of hours trying to figure out how to define range in awk like this. {1,3} Smilie
# 2  
Old 01-18-2012
Code:
awk 'match($0,"http://[0-9]+.[0-9]+.[0-9]+.[0-9]+.")' infile

--ahamed
# 3  
Old 01-18-2012
Thanks for the reply. The code doesn't work properly:

Code:
http://12345.678910.11121314.com/howaboutme

That is technically not an IP [ valid or not ], but your script accepts it.
# 4  
Old 01-18-2012
hi.. try this ...

input - filename is f7

Code:
 
http://10.0.0.1/query.exe
http://11y10x09w:80/howaboutme
http://192.168.100.190:1234/takeme.gpg
http://1923.168.100.190:1234/takeme.gpg

script
Code:
 
awk '{ if($0 ~ /^http:\/\/[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(:[0-9]{1,5})?/) print $0}' f7

output
Code:
http://10.0.0.1/query.exe
http://192.168.100.190:1234/takeme.gpg

Regards,
A!
# 5  
Old 01-18-2012
Hi A!,

For some reason, your code doesn't give me any output on my machine. I'm running Ubuntu 10.04 with GNU Awk 3.1.6 Smilie
# 6  
Old 01-18-2012
Quote:
Originally Posted by r4v3n
Hi A!,

For some reason, your code doesn't give me any output on my machine. I'm running Ubuntu 10.04 with GNU Awk 3.1.6 Smilie
From gawk documentation :
Quote:
However, because old programs may use ‘{' and ‘}' in regexp constants, by
default gawk does not match interval expressions in regexps. If either ‘--posix'
or ‘--re-interval' are specified (see Section 11.2 [Command-Line Options],
page 177), then interval expressions are allowed in regexps.
For new programs that use ‘{' and ‘}' in regexp constants, it is good practice
to always escape them with a backslash. Then the regexp constants are valid
and work the way you want them to, using any version of awk.2
Try :
Code:
awk '{ if($0 ~ /^http:\/\/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]{1,3}\.[0-9]\{1,3\}(:[0-9]\{1,5\})?/) print $0}' f7


I test the original awk command with some versions of awk :
  • Solaris /usr/bin/awk : No output
  • Solaris /usr/bin/nawk : No output
  • Solaris /usr/xpg4/bin/awk : Ok.
  • Aix : /usr/bin/awk : Ok.


Jean-Pierre.
These 2 Users Gave Thanks to aigles For This Post:
ahamed101 archimedes
# 7  
Old 01-18-2012
Thanks Jean.

This code worked :

Code:
awk --posix '/^http:\/\/[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(:[0-9]{1,5})?\// { print $0 }' filename

Apologies for not RTFM properly Smilie
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