If I were doing this for real I would use /g as Corion suggests. However, for interest's sake, here is one way to construct the pattern without repetition in the code.

#!/usr/bin/env perl

use strict;
use warnings;

my $x = "0.01 NaN 2.30 4.44";
my $r1 = join '\s+', ('([Na0-9\.\-\+]+)') x 4;
print "r1 is '$r1'\n";

my ($d, $e, $f, $g) = ($x =~ m/$r1/);
print qq($d, $e, $f, $g\n);

[download]

Note that you don't need all those backslashes so the inner character class can be shortened to just [Na0-9.+-] but it has no effect on the end result.

If this is an XY Problem, then perhaps if you explain what you are actually trying to do someone could suggest a better approach.

🦛

In reply to Re: Repeating a capture group pattern within a pattern by hippo
in thread Repeating a capture group pattern within a pattern by mldvx4

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