Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

Re^4: Finding repeat sequences. (only regex)

by BrowserUk (Pope)
on Jun 18, 2013 at 20:21 UTC ( #1039652=note: print w/ replies, xml ) Need Help??

in reply to Re^3: Finding repeat sequences. (only regex)
in thread Finding repeat sequences.

Nice reversal of the logic and closer:

$s = 'aaaabaaaabaaaaabaaaab';; $s =~ /^((.*?).*?)\2*\1$/ and print "$2/$1";; a/aaaabaaaab

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

Comment on Re^4: Finding repeat sequences. (only regex)
Download Code
Replies are listed 'Best First'.
Re^5: Finding repeat sequences. (only regex!)
by tye (Sage) on Jun 18, 2013 at 21:17 UTC

    I think I had \1 and \2 backward. Then you just have to disallow the trivial solution:

    $s = 'aaaabaaaabaaaaabaaaab'; $s =~ /^((.*?).*?)(?=.)\1*\2$/ and print "$2/$1";

    (Update: Dropped the unneeded () around \1 that I had introduced while debugging. You probably also need to change .*? to .* so you get the longest solution not the shortest.)

    - tye        

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1039652]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (4)
As of 2015-12-02 02:20 GMT
Find Nodes?
    Voting Booth?

    My keyboard shows this many letters:

    Results (31 votes), past polls