AWK with multiple delimiters


 
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# 1  
Old 09-06-2010
AWK with multiple delimiters

I have the following string sample:
bla bla bla [123] bla bla

I would like to extract the "123" using awk.

I thought about awk -F"[\[\]]" '{ print $1 }' but it doesn't work

Any ideas ?
# 2  
Old 09-06-2010
Code:
awk -F"[\\\[\\\]]" '{print $2}' file

Don't ask how it works, cause I have no idea Smilie
Another way, with a little less escaping:
Code:
awk -F'[\\[\\]]' '{print $2}' file

This User Gave Thanks to bartus11 For This Post:
# 3  
Old 09-06-2010
Works great - Thanks!

---------- Post updated at 09:32 PM ---------- Previous update was at 09:12 PM ----------

BTW - I am trying to capture STDOUT so hence not read a 'file' but passing the string to awk via a pipe. $0 shows the whole string but $1 shows NULL so it doesn't seem to like the delimiters.

eg. I am trying this:
STR="bla bla bla [123] bla bla" #normally the stdout from a command line call of a software product
RUNID=`echo ${STR} | awk -F'[\\[\\]]' '{print $2}'`
echo ${ID}

There's probably a better way to do it but I haven't coded for years.
any ideas?
# 4  
Old 09-06-2010
Quote:
Originally Posted by bartus11
Code:
awk -F"[\\\[\\\]]" '{print $2}' file

Don't ask how it works, cause I have no idea Smilie
Another way, with a little less escaping:
Code:
awk -F'[\\[\\]]' '{print $2}' file

This link might shade light explaining the difference between a regexp constant and a string constant
This User Gave Thanks to Aia For This Post:
# 5  
Old 09-06-2010
Quote:
Originally Posted by Aia
This link might shade light explaining the difference between a regexp constant and a string constant
I ment that the escaping part is a mistery to me Smilie (why does awk need so many backslashes?). I think I'm quite good with using regexes as well as understanding them Smilie

After taking a closer look at your link, I think it really did shade a little light on that escaping part of AWK. Thanks ;]

Last edited by bartus11; 09-06-2010 at 06:59 PM..
# 6  
Old 09-06-2010
Code:
awk -F'[][]' '{print $2}'

This User Gave Thanks to Scrutinizer For This Post:
# 7  
Old 09-06-2010
Quote:
Originally Posted by gdub
Works great - Thanks!

---------- Post updated at 09:32 PM ---------- Previous update was at 09:12 PM ----------

BTW - I am trying to capture STDOUT so hence not read a 'file' but passing the string to awk via a pipe. $0 shows the whole string but $1 shows NULL so it doesn't seem to like the delimiters.

eg. I am trying this:
STR="bla bla bla [123] bla bla" #normally the stdout from a command line call of a software product
RUNID=`echo ${STR} | awk -F'[\\[\\]]' '{print $2}'`
echo ${ID}

There's probably a better way to do it but I haven't coded for years.
any ideas?
Try:
Code:
STR="bla bla bla [123] bla bla"
RUNID=$(echo ${STR} | awk -F'[\\[\\]]' '{print $2}')
echo ${RUNID}

BTW, if you wanted to use backticks (`) and (") you would need to do this to make it work (not counting Scrutinizer's solution):
Code:
RUNID=`echo ${STR} | awk -F"[\\\\\[\\\\\]]" '{print $2}'`

which is some terrible abomination to me Smilie
This User Gave Thanks to bartus11 For This Post:
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