Hi monks i have a little question which hopefully u cud help with. i am trying to compare versions of some software and they are in a string of X.Y.Z format. so to compare these versions i thought of using substring but the problem that arises is that the format can be in a X.YY.Z or X.Y.ZZ format as well i was hoping to use regular expressions for this but i could only find expressions to match strings and not to grab certain parts of the string. 
#!/usr/bin/perl

# Checking of ETS version
my $version;
open (VERSION,'path');
while (<VERSION>){
$version=$_;
chomp ($version);
}
my ($X,$Y,$Z);
if ($version =~ /(\d\.\d\.\d)/)
{
$X = substr $version, 0, 1,;
$Y = substr $version, 3, 4,;
$Z = substr $version, 6, 7,;
}
elsif($version =~ /(\d\.\d\d\.\d)/)
{
$X = substr $version, 0, 1,;
$Y = substr $version, 3, 5,;
$Z = substr $version, 7, 8,;
}

elsif($version =~ /(\d\.\d\.\d\d)/)
{
$X = substr $version, 0, 1,;
$Y = substr $version, 3, 4,;
$Z = substr $version, 7, 9,;
}

elsif($version =~ /(\d\.\d\d\.\d\d)/)
{
$X = substr $version, 0, 1,;
$Y = substr $version, 3, 5,;
$Z = substr $version, 7, 9,;
}


print "X,Y,Z Values are $X,$Y,$Z";

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pls note that as of nw i am only trying to get the values from the string and nothing else. and as u can see it is nt a very efficient way of doing it. i was hoping u monks would have a better idea of doing it efficiently

In reply to regular Expression by perlassassin27

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