This didn't run as fast as the previously posted solution. It took me a while to wrap my head around the range operator, but I modified the code as follows, and now it runs faster than Kc12349's solution, though not quite as fast as ikegami's:

foreach ( split ( /^/m, $string ) )
{
  state $saw = 0;
  if ( my $seq = ( /^Heading Here:$/ .. /^Another Heading:$/ or
                   /^Another Heading:$/ .. /^End of section:/ ) )
  {
    redo if $seq =~ /E0$/;
    print $seq != 1 ? "  " : ! $saw++ ? "\n" : "";
  }
  print;
}

[download]

I do find this solution quite elegant though - thanks!

Arnon Weinberg Back2Front - The Web Site People

In reply to Re^2: Regexp help by thewebsi
in thread Regexp help by thewebsi

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.