Hello Monks,

There are two directories(for eg. alpha and gamma), which contain numerous xml files . each xml file in alpha corresponds to a file in gamma directory . The naming convention of these two files in two directories have a pattern for eg

File in alpha -> abc_12342_tick.xml.alphaprod

File in gamma -> abc_12342_tick.xml.gammatest

What I am trying to achieve is a hash with these file names paired. here is what I did. @alphafiles and @gammafiles contains the file list from alpha and gamma directory. 

@hash{@alphafiles}=();
foreach (keys %hash){
my $patt=substr($_,0,index($_,"xml"));
@matched=grep(/^$patt/,@gammafiles);
$hash{$_} = $matched[0];
}

[download]
This code works fine for a smaller set of files in these directories but for a large set of files the number of iterations increases and it becomes extremely slow like takes 90 mins to pair up 30000 files in each directory. I also tried a simpler approach of sorting @alphafiles and @gammafiles lists first and then pairing them like below 

@sortalpha= sort @alphafiles;
@sortgamma= sort @gammafiles;
$i=0;
 while($i <= $#sortprod)
{
$hash{$sortalpha[$i]}=$sortgamma[$i];
$i++;
}

[download]
This method takes hardly a couple of minutes but I doubt the reliability of this approach.I need to make sure I pair the correct files from the two directories.I seek your wisdom. Is there a way to apply a regex during sorting of the arrays which yields files at the correct positions before clubbing?

Thanks in advance

/zoop

'When You starve With A Tiger, The Tiger always starves last'

In reply to File pairing from different directories by Zoop

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