Solved

AWK script to extract a text between a pattern

Posted on 2004-07-30
9
925 Views
Last Modified: 2008-01-09
Hi,

I have a text file , I need to extract text between a specified pattern, say open close brackets.

eg:
Input_value(myval)

I need to extract myval.

How can do this by using awk / cut etc ??

Any help will be appreciated.
0
Comment
Question by:a_anitha
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 45

Accepted Solution

by:
sunnycoder earned 25 total points
ID: 11682880
sed 's/[^(]*(\([^)]*\).*/\1/' input_file
0
 
LVL 23

Assisted Solution

by:Mysidia
Mysidia earned 25 total points
ID: 11684574
The following awk code will read one level of markers, i.e.

Ab(
  cd)          will give "cd"

Input ab(cd(ef))  will yield cdef

awk 'BEGIN{paren = 0} ; {s = ""; for(i=1;i <= length($0); i++){ch=substr($0, i, 1); if (ch == "("){paren++} else if (ch == ")") {paren--} else if (paren > 0) {s = s ch}} if (length(s) > 0) {print s}}'
0
 

Author Comment

by:a_anitha
ID: 11691055
How should I provide the input file to the awk script ??
0
Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

 
LVL 20

Expert Comment

by:Gns
ID: 11693614
Assuming linux, it's not so unlikely to assume gawk... In which case we could do
# echo "ab(cd(ef))" | awk '{match($0,"\\((.*)\\)",aa); print aa[1]}'
cd(ef)
,,, which perhaps is more close to what's needed?

-- Glenn
0
 
LVL 23

Expert Comment

by:Mysidia
ID: 11787460
To provide input to an awk script you can pipe it in from another command

like  somecommand | awk ' ... script ...'

Or supply the filename as an argument
     
    awk '... script ...'   inputfile
0
 
LVL 22

Expert Comment

by:pjedmond
ID: 11800964
..or:

cat filename | awk ' ....             etc
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

rdate is a Linux command and the network time protocol for immediate date and time setup from another machine. The clocks are synchronized by entering rdate with the -s switch (command without switch just checks the time but does not set anything). …
The purpose of this article is to demonstrate how we can use conditional statements using Python.
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question