Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Re: regex backreference

by Kenosis (Priest)
on Nov 30, 2013 at 16:49 UTC ( #1065065=note: print w/replies, xml ) Need Help??


in reply to regex backreference

Perhaps the following will be helpful:

use strict; use warnings; my %seen; while (<DATA>) { !$seen{ $. . $1 }++ and print "Line $.: $1\n" while /(\b\w{3}\b)(?=.*\1)/g; } __DATA__ foofoo foo foo foo bar foo foo bar foo bar foooof foo oof foo and bar foo foo and and bar bar foo and bar foo and bar and or and or say or say or say or say

Output:

Line 2: foo Line 3: foo Line 4: foo Line 4: bar Line 8: foo Line 8: and Line 8: bar Line 9: foo Line 9: and Line 9: bar Line 10: and Line 10: say

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1065065]
help
Chatterbox?
[Corion]: And if you only have two candidates, you can expect some of the stupid people to make the "right" choice by chance ;)
[erix]: I think it's a little worse this time :)
[Discipulus]: yes; even broken clock show the right time twice a day

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (8)
As of 2017-01-24 08:40 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you watch meteor showers?




    Results (203 votes). Check out past polls.