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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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    [1nickt]: You must twist and pull! If you burn, use tea tree oil etc, the tick barfs (inside your blood vessel) and you get all the loevely bacteria in his gut transferred to yours.
    [1nickt]: tweesers work just fine
    [hippo]: Hope everyone else is enjoying their lunch too.
    [1nickt]: However, note that it takes between 2 and 4 hours for a tick to be able to start transmitting bacteria. So even if it has burrowed in and started eating, if you get it soon you should be OK.
    [perldigious]: 1nickt: No more red meat! It would be more humane to just kill you, wouldn't it! :-)
    [1nickt]: Just don't make it barf.
    [1nickt]: perldigious that's exactly what my stepson says.
    [1nickt]: the tick that can make you a vegetarian
    [perldigious]: Your Mother: Yeah, I have a tool for ticks that I use (mostly on my dogs thankfully), but it's just a cheapo one I got from my vets office... it works pretty good though.
    erix saw a tick in a natural history museum collected from the scrotum of the curator (it was removed)

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