This is pulling out all the digits. The OP is just asking for the "digits between the spaces". 
my $x = "a1aa11 b2bb22bbb222 c3cc33";
my @nums = $x =~ /\d+/g;
print join(" ", @nums) . "\n";

Output:
1 11 2 22 222 3 33

[download]
Ikegami's answer is pulling out the numbers between the spaces.

In reply to Re^2: regex for multiple capture within boundary by swkronenfeld
in thread regex for multiple capture within boundary by xafwodahs

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