Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Re: Pattern Finding

by runrig (Abbot)
on Sep 11, 2001 at 03:08 UTC ( #111624=note: print w/ replies, xml ) Need Help??


in reply to Pattern Finding

Untested, and not very thought out:

$_ = "hellohiworldhellohiworldhellohiworldhellohiworld"; if (/^((.+?)\2+)$/) { print "[$1][$2]\n"; }
Update: Hmm, this does not work, and I'm not sure why (regex bug? or bad code?) :-(

Ok, got the above code to work at least the way I was expecting, but still probably not what you want.

<update>Though here's something that seems to do what you want:

use warnings; use strict; $_ = "helloworldhellohellohihellohiworld"; my %pttrns; PTTRN: { if (/\G(.{2,})(?=.*?\1)/g) { $pttrns{$1}++; SKIP: { my $again; for my $pat (keys %pttrns) { if (substr($_, pos, length $pat) eq $pat) { pos() += length($pat); redo SKIP; } } } redo PTTRN; } } print "[$_]\n" for keys %pttrns; ~/tmp >./tst [world] [hello] [hi]


Comment on Re: Pattern Finding
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://111624]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (17)
As of 2015-07-02 17:40 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (44 votes), past polls