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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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LEARN ABOUT PLAN9

stdbuf

STDBUF(1)							   User Commands							 STDBUF(1)

NAME

       stdbuf - Run COMMAND, with modified buffering operations for its standard streams.

SYNOPSIS

       stdbuf OPTION... COMMAND

DESCRIPTION

       Run COMMAND, with modified buffering operations for its standard streams.

       Mandatory arguments to long options are mandatory for short options too.

       -i, --input=MODE
	      adjust standard input stream buffering

       -o, --output=MODE
	      adjust standard output stream buffering

       -e, --error=MODE
	      adjust standard error stream buffering

       --help display this help and exit

       --version
	      output version information and exit

       If MODE is 'L' the corresponding stream will be line buffered.  This option is invalid with standard input.

       If MODE is '0' the corresponding stream will be unbuffered.

       Otherwise  MODE	is a number which may be followed by one of the following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T,
       P, E, Z, Y.  In this case the corresponding stream will be fully buffered with the buffer size set to MODE bytes.

       NOTE: If COMMAND adjusts the buffering of its standard streams ('tee' does for example) then that will override	corresponding  changes	by
       'stdbuf'.  Also some filters (like 'dd' and 'cat' etc.) don't use streams for I/O, and are thus unaffected by 'stdbuf' settings.

EXAMPLES

       tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq
       This will immediately display unique entries from access.log

BUGS

       On GLIBC platforms, specifying a buffer size, i.e., using fully buffered mode will result in undefined operation.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report stdbuf translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/stdbuf>
       or available locally via: info '(coreutils) stdbuf invocation'

GNU coreutils 8.28						   January 2018 							 STDBUF(1)
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