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Full Discussion: Extract n-digits from string in perl
Top Forums Shell Programming and Scripting Extract n-digits from string in perl Post 303003080 by james2009 on Thursday 7th of September 2017 11:43:23 AM
Old 09-07-2017
Quote:
Originally Posted by rbatte1
I would suggest using split being saved to an array, then display the appropriate field. Perhaps something like this might help:-
Code:
  my $line = "01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main" ;

  my @tmp_array = split (/ /,$line) ;
  print $tmp_array[9] ;


Does that help?
Robin
Thanks Robin, but i'm looking at a situation where the 8-digit number can appear in another position in the string. In that case it will not always be the 9th element of the array.

---------- Post updated at 10:43 AM ---------- Previous update was at 10:28 AM ----------

Quote:
Originally Posted by durden_tyler
If the 8-digit number is always preceded by the word "STATE:" then you could use regular expressions as well:

Code:
$
$ cat mylog.txt
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main
$
$ perl -lne 'print $1 if /STATE:\s+(\d+)/' mylog.txt
01170255
$

If it could be preceded by more than word, then specify them all in your regular expression, like so:

Code:
$
$ cat mylog_1.txt
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main
something else
over here
01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, BLAH: 12345678 (mode main
some other stuff
$
$ perl -lne 'print $2 if /(STATE|BLAH):\s+(\d+)/' mylog_1.txt
01170255
12345678
$

How can i do this inside a perl script and not on the command line?
 

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