Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Perl - Grep function regular expression
Top Forums Shell Programming and Scripting Perl - Grep function regular expression Post 302446454 by adelsin on Wednesday 18th of August 2010 07:26:41 PM
Old 08-18-2010
Perl - Grep function regular expression
For some reason,
@logs is a list of log files
@filter is a list of expressions to grep out
Code:
foreach (@logs){
open READ, "<$_" or die $!;
@temp=<READ>;
close READ;

    foreach (@filter){
        print grep /$_/,@temp ;    
        
}
}

returns a regex error in one of the files it's parsing.

while
Code:
print grep $_,@temp ;

returns the entire file

while
Code:
print grep /string/,@temp ;

works fine.


I can not seem to wrap my head around it today. Any clues?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

grep : regular expression

guys, my requirment goes like this: I have a file, and wish to filter out records where 1. The first letter is o or O and 2. The next 4 following letter should not be ther I do not wish to use pipe and wish to do it in one shot. The best expression I came up with is: grep ^*... (10 Replies)
Discussion started by: RishiPahuja
10 Replies

2. UNIX for Advanced & Expert Users

regarding grep regular expression

When i do ls -ld RT_BP* i am getting the following list. drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP809 drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP809.O drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP810 drwxrwx--- 2user group 256 Oct... (2 Replies)
Discussion started by: ukatru
2 Replies

3. Shell Programming and Scripting

grep with regular expression

Hi, guys. I have one question, hope somebody can give me a hand I have a file called passwd, the contents of it arebelow: *********************** ... goldsimj:x:5008:200: goldsij2:x:5009:200: whitej:x:5010:201: brownj:x:5011:202: goldsij3:x:5012:204: greyp:x:5013:203: ...... (6 Replies)
Discussion started by: daikeyang
6 Replies

4. Shell Programming and Scripting

grep regular expression

please can someone tell me what the following regrex means grep "^aa*$" <file> I thought this would match any word beginning with aa and ending with $, but it doesnt. Thanks in advance Calypso (7 Replies)
Discussion started by: Calypso
7 Replies

5. Shell Programming and Scripting

Help with grep / regular expression

Hi, Input file: -13- -1er- -1xyz1- -1xz12- -2ab1- -2ab2-- -143- Code: grep '^*\-' input.txt Wrong output: -13- -1xyz1- -2ab1- -2ab2-- (4 Replies)
Discussion started by: dragon.1431
4 Replies

6. UNIX for Advanced & Expert Users

regular expression for split function in perl

Hi, Below is an example of a record I have, which I wish to split using the perl's split function and load it into an array. I am having tough time figuring out the exact reg-ex to perform the split. Given record: "a","xyz",0,2,48,"abcd","lmno,pqrR, stv",300,"abc",20, The delimiter to... (4 Replies)
Discussion started by: jghoshal
4 Replies

7. Shell Programming and Scripting

Hidden Characters in Regular Expression Matching Perl - Perl Newbie

I am completely new to perl programming. My father is helping me learn said programming language. However, I am stuck on one of the assignments he has given me, and I can't find very much help with it via google, either because I have a tiny attention span, or because I can be very very dense. ... (4 Replies)
Discussion started by: kittyluva2
4 Replies

8. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print... (1 Reply)
Discussion started by: jessy83
1 Replies

9. Shell Programming and Scripting

Grep + Regular expression or

Hi , I have few lines like A20120101.ANU.ZIP A20120401.ABC.ZIP A20120105.KJK.ZIP A20120809.JUG.ZIP A20120101.MAT.ZIP B20120301.ANU.XIP I want to filter by 1. Files starting with A and Ending With Z ( ^A.*.ZIP$) 2. And either ANU, or KJK or MAT in the file name. Hope my... (6 Replies)
Discussion started by: Anupam_Halder
6 Replies

10. UNIX for Beginners Questions & Answers

Grep regular expression

I want to track only below: I am using below, but it doesn't work: (6 Replies)
Discussion started by: proactiveaditya
6 Replies

LEARN ABOUT NETBSD

getbuildlog

GETBUILDLOG(1)						      General Commands Manual						    GETBUILDLOG(1)

NAME

       getbuildlog - download build logs from Debian auto-builders

SYNOPSIS

       getbuildlog package [version-pattern] [architecture-pattern]

DESCRIPTION

       getbuildlog downloads build logs of package from Debian auto-builders. It downloads build logs of all versions and for all architectures if
       version-pattern and architecture-pattern are not specified or empty, otherwise only build logs whose  versions  match  version-pattern  and
       build  logs  whose  architectures  match  architecture-pattern will be downloaded. The version and architecture patterns are interpreted as
       extended regular expressions as described in grep(1).

       If version-pattern is "last" then only the logs for the most recent version of package found on buildd.debian.org will be downloaded.

       If version-pattern is "last-all" then the logs for the most recent version found on each build log index will be downloaded.

OPTIONS

       -h, --help
	      Show usage information and examples.

       -V, --version
	      Show version and copyright information.

EXAMPLES

       getbuildlog hello 2.2-1 amd64
	      Download amd64 build log for hello version 2.2-1.

       getbuildlog glibc "" mips.*
	      Download mips(el) build logs of all glibc versions.

       getbuildlog wesnoth .*bpo.*
	      Download all build logs of backported wesnoth versions.

AUTHOR

       Written by Frank S. Thomas <fst@debian.org>.

DEBIAN
								 Debian Utilities						    GETBUILDLOG(1)
All times are GMT -4. The time now is 07:53 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy