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... and if you still want a one-step approach ...

This must be a job for the /g modifier and its side-kick, \G:

my (@match) = $str =~ /(?:^foo |(?<!^)\G)m (\d+) (?=(?:m \d+ )*bar)/g;

(The negative lookbehind in order to prevent matching strings starting with the m \d+ pattern — the positive lookahead to prevent matching strings that don't properly close with bar.)

With a little test case, it looks like this:

my @test = ( 'foo m 1 m 2 m 3 m 4 bar', 'foo m 2 m 4 m 7 bar', 'foo m 1 bar', 'm 2 foo m 1 bar', 'foo m 1 c 2 bar', 'foo m 1 bar m 2', 'foo m 1 m 5 m 7', ); for my $str (@test) { my (@match) = $str =~ /(?:^foo |(?<!^)\G)m (\d+) (?=(?:m \d+ )*bar)/ +g; local $" = ', '; print "'$str' => (@match)\n"; }

... and outputs like this:

'foo m 1 m 2 m 3 m 4 bar' => (1, 2, 3, 4) 'foo m 2 m 4 m 7 bar' => (2, 4, 7) 'foo m 1 bar' => (1) 'm 2 foo m 1 bar' => () 'foo m 1 c 2 bar' => () 'foo m 1 bar m 2' => (1) 'foo m 1 m 5 m 7' => ()

Update: Almost missed the "bar" requirement. Fixed now, right?

print "Just another Perl ${\(trickster and hacker)},"
The Sidhekin proves Sidhe did it!


In reply to Re: Arbitrary number of captures in a regular expression by Sidhekin
in thread Arbitrary number of captures in a regular expression by grinder

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