Approximation: it captures single lines that do not contain @, and multiple lines (if possible) containing patterns that start and end with @.
Not that it helps much, but here it is in action. Anyone have ideas on what it's trying to find?
#! /usr/bin/perl
use strict;
use warnings;
my $file = do {local $/, <DATA>};
my @cvs = $file =~ /((?:(?:[^\n@]+|@[^@]*@)\n?)+)/gs;
print "matched [[$_]]\n" for @cvs;
__DATA__
line 1
line 2
line 3
longer @line@ with @some stuff@
line with nothing on it
line 4
and the output is:
matched [[line 1
line 2
line 3
longer @line@ with @some stuff@
line with nothing on it
]]
matched [[line 4
]]
pbeckingham - typist, perishable vertebrate.
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