Something like this may do the job:
use strict;
use warnings;
use feature qw/ :5.10 /;
my @str = ("j k l foobar", "foobar", "jkl foobar", "1 2 3",
+ "jk l foobar", "foobar j k l", "foobar j kl", " ", " ", "j
+ jk foobar", "j k jk foobar", "j k l");
my $rx = qr/^((?:\w(?:\s+|\z))*)(.*)/;
for my $str (@str){
my ($i,$s) = $str =~ /$rx/;
$i =~ s/\s+//g;
say $i ? join " ",$i,$s : $s;
}
Outputs:
jkl foobar
foobar
jkl foobar
123
jk l foobar
foobar j k l
foobar j kl
j jk foobar
jk jk foobar
jkl
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