Is this you are expecting.
Example-1
my $str="1 2 3 4 590";
my ($a,$b)=split(/ ([^ ]+)$/, $str);
print "a=$a\nb=$b\n";

[download]

Output
a=1 2 3 4
b=590

Example-2 
 
my $str="1:2:3:4:590";
my ($a,$b)=split(/:([^:]+)$/, $str);
print "a=$a\nb=$b\n";

[download]

Output
a=1:2:3:4
b=590

In reply to Re^3: Splitting on a pattern once by kiruthika.bkite
in thread Splitting on a pattern once by perlpal

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