Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

... 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

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others examining the Monastery: (7)
    As of 2014-11-28 07:21 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My preferred Perl binaries come from:














      Results (193 votes), past polls