Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Answer: How do I do a natural sort on an array?

( #411403=categorized answer: print w/ replies, xml ) Need Help??

Q&A > sorting > How do I do a natural sort on an array? contributed by Jammerwoch

I wrote the following before finding the delightful Sort::Naturally library function. I reccommend using that over what I've done, but maybe people are curious how it might be done. Or maybe someone needs to fine-tune or customize it.

The following code is NOT efficient. In particular, the calling of naturalSortInner with $a and $b as arguments completely eliminates the efficiency of having $a and $b. However, it was necessary for the recursive nature of naturalSortInner.

#!/usr/bin/perl sub naturalSortInner { $x = uc( shift ); $y = uc( shift ); if( !($x =~ /\d+(\.\d+)?/) ) { return $x cmp $y; } $xBefore = $`; $xMatch = $&; $xAfter = $'; if( !($y =~ /\d+(\.\d+)?/) ) { return $x cmp $y; } if( $xBefore eq $` ) { if( $xMatch == $& ) { return naturalSortInner( $xAfter, $' ); } else { return $xMatch <=> $&; } } else { return $x cmp $y; } print "\n<before: '$xBefore', match: '$xMatch', after: '$xAfter'>\ +n"; } sub naturalSort { naturalSortInner( $a, $b ); } @arr = ( 'beta', 'Alpha', 'Gamma1', 'Gamma', '23', '5', 'Version1', 'Version1.1', 'Version1.2', 'Version11.1-Sub1', 'Version11.1-Sub10', 'Version11.1-Sub3', 'x23sub5', 'Version2', 'Version2.1', 'GammaGlobulin', 'Gamma10', 'c', 'Gamma2', 'Gamma3', ); print join( "\n", sort naturalSort @arr ) . "\n";

Comment on Answer: How do I do a natural sort on an array?
Download Code
Log In?
Username:
Password:

What's my password?
Create A New User
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: (18)
As of 2015-07-31 17:47 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 (279 votes), past polls