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Top Forums Shell Programming and Scripting Extract the text between the nth occurrence of square brackets Post 302820191 by Subhadeep_Sahu on Wednesday 12th of June 2013 10:14:14 AM
Old 06-12-2013
Question Extract the text between the nth occurrence of square brackets

Please can someone help with this?

I have a file with lines as follows:

Code:
word1 word2 word3 [11231] word4 word5 word6 [242] word7 word8
word1 word2 word3 [34534] word4 word5 word6 [34] word7 word8
word1 word2 word3 [345] word4 word5 word6 [2354] word7 word8
word1 word2 word3 [2342354123] word4 word5 word6 [23441] word7 word8

When I use the command
Code:
perl -lne 'print $1 while (/\[(.*?)\]/g)

'

I get the results as follows.
Code:
11231
242
34534
34
345
2354
2342354123
23441

How do I modify my script to get only the numbers inside the first set of square brackets, giving an output as follows?
Code:
11231
34534
345
2342354123

Also, how can I get only the numbers inside the second set of square brackets, giving an output as follows?
Code:
242
34
2354
23441

It isn't necessary to use perl, I can do with sed/awk, or anything else.

Last edited by jim mcnamara; 06-12-2013 at 11:24 AM..
 

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pydhcplib.strlist(3)						     PYDHCPLIB						      pydhcplib.strlist(3)

NAME
pydhcplib.strlist - Internal type of pydhcplib for lists of bytes processing. SYNOPSIS
from pydhcplib.type_hw_addr import hwmac a = strlist() a = strlist([100,100,10,42,44,26]) DESCRIPTION
The class pydhcplib.strlist is an specific type of pydhcplib. It exist in order to simplify processing of raw data from network. When a dhcp packet dhcp is received, it's a succession of approximately 300 bytes. Within pydhcplib these data are transformed in an intermediary form of type "strlist" in order to facilitate their handling. This intermediary form will eventually be suppressed in the stable versions of pydhcplib to speedup the processing time, but backward compatibility will be assured. The pydhcplib.strlist class creation argument can be a list of numbers whose value goes from 0?55. The pydhcplib.strlist class creation argument can be a string of ASCII character. METHODS
The implemented methods in this type are mostly comparison methods (= =, >, etc...) else : str() convert the address into a printable string type. list() convert the address into a list of bytes. EXAMPLES
Example program strlist_example.py : from pydhcplib.type_strlist import strlist word = strlist() word1 = strlist("azerty") word2 = strlist("qwerty") word3 = strlist([97, 122, 101, 114, 116, 121]) print "a0 : ",word print "a1 : ",word1 print "a2 : ",word2 print "a3 : ",word3 if word1 == word2 : print "test 1 : ",word1, "==",word2 else : print "test 1 : " ,word1, "!=",word2 if word1 == word3 : print "test 2 : ", word1, "==",word3 else : print "test 2 : ", word1, "!=",word3 SEE ALSO
pydhcp(8), pydhcplib.hwmac(3), pydhcplib.ipv4(3), pydhcplib.strlist(3), pydhcplib.DhcpPacket(3), pydhcplib.DhcpBasicPacket(3), pydhc- plib.DhcpNetwork(3), pydhcplib.DhcpClient(3), pydhcplib.DhcpRawClient(3), pydhcplib.DhcpDerver(3) BUGS
See http://pydhcplib.tuxfamily.org/ for more information. AUTHOR
Mathieu Ignacio (mignacio[AT]april.org) pydhcplib.strlist(3)
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