Did you try your solution? It doesn't add a trailing newline (nor fix the more important problem). Here's my next stab:
#!/usr/bin/perl -w
use strict;
my @lines= (
join( '',
"0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,",
'c'x50,
",16,17,18,19,20,21,22,23,24,25,26,27",
),
join( '',
"0,1,2,3,4,\n5,6,7,8,9,10,11,12,13,14,15,",
'c'x50,
",16,17,18,19,20,21,22,23,24,25,26,27",
),
);
for my $line ( @lines ) {
print "\n";
$_= $line;
s/([^\n]{0,14},|[^\n]{15})(?!\n)/$1\n/g;
print "tye 1\n($_)\n";
$_= $line;
s/([^\n]{0,14},|[^\n]{15})(?=[^\n])/$1\n/g;
print "ikegami\n($_)\n";
$_= $line;
s/((?:[^\n]{0,15}$)|(?:[^\n]{0,14},)|(?:[^\n]{15})(?=[^\n]))/$1\n/
+g;
print "braveghost\n($_)\n";
$_= $line;
s/((?:[^\n]{1,15}$)|(?:[^\n]{0,14},)|(?:[^\n]{15})(?=[^\n]))/$1\n/
+g;
print "braveghost +1\n($_)\n";
$_= $line;
s{(
(?:[^\n]{1,15})(?=\n|$) # Line requiring no wrapping
| (?:[^\n]{0,14},)(?!\n) # Line that can be wrapped at comma
| (?:[^\n]{15})(?!\n) # Line to be wrapped, not at comma
)\n?
}{$1\n}gx;
print "tye 2\n($_)\n";
}
__END__
tye 1
(0,1,2,3,4,5,6,
7,8,9,10,11,12,
13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26, # Oops, extra newline
27) # Oops, no trailing newline
ikegami
(0,1,2,3,4,5,6,
7,8,9,10,11,12,
13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23, # (Exact same problems as above)
24,25,26, # Oops, extra newline
27) # Oops, no trailing newline
braveghost
(0,1,2,3,4,5,6,
7,8,9,10,11,12,
13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
) # Oops, /two/ trailing newlines
braveghost +1
(0,1,2,3,4,5,6,
7,8,9,10,11,12,
13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
) # Changing 0 to 1 fixes that
tye 2
(0,1,2,3,4,5,6,
7,8,9,10,11,12,
13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
) # Also works
...
braveghost
(0,1,2,3,4, # Oops, extra newline
5,6,7,8,9,10,
11,12,13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
)
braveghost +1
(0,1,2,3,4, # s/0/1/ doesn't fix this
5,6,7,8,9,10,
11,12,13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
)
tye 2
(0,1,2,3,4,
5,6,7,8,9,10,
11,12,13,14,15,
ccccccccccccccc
ccccccccccccccc
ccccccccccccccc
ccccc,16,17,18,
19,20,21,22,23,
24,25,26,27
) # Yay!