grep with negative lookbehind

Posted by Dan Fabulich on Stack Overflow See other posts from Stack Overflow or by Dan Fabulich
Published on 2010-03-22T04:19:56Z Indexed on 2010/03/22 4:21 UTC
Read the original article Hit count: 806

Filed under:

perl

|

grep

|

regex

|

negative-lookbehind

I'm trying to grep through a bunch of files in nested subdirectories to look for regular expression matches; my regex requires negative lookbehind.

Perl has negative lookbehind, but as far as I can tell GNU grep doesn't support negative lookbehinds.

What's the easiest way to get an equivalent to GNU grep that supports negative lookbehinds?

(I guess I could write my own mini-grep in Perl, but that doesn't seem like it should be necessary. My copy of the Perl Cookbook includes source for tcgrep; is that what I should use? If so, where's the latest version? Don't tell me I have to type this entire program!)

© Stack Overflow or respective owner

Related posts about perl

Munin on Centos 6 - missing perl MODULE_COMPAT_5.8.8

as seen on Server Fault - Search for 'Server Fault'
I'm trying to install Munin on a new VPS through yum install munin but I keep getting an error about a missing perl module: Requires: perl(:MODULE_COMPAT_5.8.8). This is the perl version currently installed: v5.10.1. I've searched all around and still haven't found a solution for this. Here's the… >>> More
Pain removing a perl rootkit

as seen on Server Fault - Search for 'Server Fault'
So, we host a geoservice webserver thing at the office. Someone apparently broke into this box (probably via ftp or ssh), and put some kind of irc-managed rootkit thing. Now I'm trying to clean the whole thing up, I found the process pid who tries to connect via irc, but i can't figure out who's… >>> More
How To Avoid a Perl script calling an Another Perl Script

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, i am calling a perl script client.pl from a main script to capture the output of client.pl in @output. is there anyway to avoid the use of these two files so i can use the output of client.pl in main.pl itself here is my code.... main.pl ======= my @output = readpipe("client.pl"); client… >>> More
Perl :how to sort dates in perl

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, How can I sort the dates in perl. my @dates = ( "02/11/2009" , "12/20/2001" , "11/21/2010" ) ; I have above dates in my array . How can I sort those dates... ? My date format is dd/mm/YYYY. >>> More
please suggest a perl book exclusively for perl programs

as seen on Stack Overflow - Search for 'Stack Overflow'
I want tha name of a perl book for only PERL PROGRAMS. The reason behind is I want to improve my programming skill in perl >>> More

Related posts about grep

grep is inconsistently defaulting to grep -P?

as seen on Server Fault - Search for 'Server Fault'
I have a script that does some housekeeping that works perfectly well when invoked from an interactive shell, but did nothing when invoked by cron. To troubleshoot this I started a shell with a 'blank' environment with the command: env -i /bin/bash --noprofile --norc Using this blank env I've dug… >>> More
grep pattern interpretted differently in 2 different systems with same grep version

as seen on Server Fault - Search for 'Server Fault'
We manufacture a linux appliance for data centers, and all are running fedora installed from the same kickstart process. There are different hardware versions, some with IDE hard drives and some SCSI, so the filesystems may be at /dev/sdaN or /dev/hdaN. We have a web interface into these appliances… >>> More
grep --exclude/--include syntax (do not grep through certain files)

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm looking for the string "foo=" (without quotes) in text files in a directory tree. It's on a common Linux machine, I have bash shell: grep -ircl "foo=" * In the directories are also many binary files which match "foo=". As these results are not relevant and slow down the search, I want grep… >>> More
Grep failing with Emacs (windows), and GnuWin32 Grep

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I've downloaded and installed the GnuWin32 tools, and added the grep executables to the Emacs bin. I've also, for what its worth, added the GnuWin32 bin folder to my Path variable. Problem is though, when I try and run with suggested grep commands, I always get: Grep exited abnormally with… >>> More
How to grep a line start with "*" using grep

as seen on Super User - Search for 'Super User'
Hi, How can I use 'grep' to get lines start with '* ' in my file? I tried grep "" myfile I tried grep " " myfile but returns all the lines of my file. Thank you. >>> More