This is a little weird. Can somebody explain this.
#!/usr/bin/perl -w $_ = "The quick\n\nbrown fox\njumped."; print "-------------\n"; foreach (/(.*)$/gm){ print "[$_]\n"; } print "-------------\n"; foreach (/^(.*)/gm){ print "[$_]\n"; } print "-------------\n"; foreach (/^(.*)$/gm){ print "[$_]\n"; } print "-------------\n";
Produces the following
------------- [The quick] [] [] [brown fox] [] [jumped.] [] ------------- [The quick] [] [brown fox] [jumped.] ------------- [The quick] [] [brown fox] [jumped.] -------------
Even though I found a solution to the problem, I still don't have an explanation for it. Does anybody know what is going on in the engine?

I've added use re qw(debug); to the script and looked and in the first example it says it matched 0 of 32767 times when the position is still on character 9. On the second set, this doesn't happen. How is this matching twice on the first time. Also I tried this
#!/usr/bin/perl -w $_ = "The quick\n\nbrown fox\njumped."; print "-------------\n"; foreach (/(?:^|\G)(.*)/gm){ print "[$_]\n"; } print "-------------\n";
And look what it did
------------- [The quick] [] [] [brown fox] [] [jumped.] [] -------------
Hmmmmmmm.

In reply to Re: Bother (Re: Re: Split and empty strings) by Rhandom
in thread Split and empty strings by andye

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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.