How to parse multiline data records using Perl regular expression?

This line (warn "could not parse block:\n$_\n";) of the attached code gives a warning when the data record contains these lines: Which tells me if there is no line between @ line and window line, the code will not parse.

But passes when in this line format


I think the solution is to change this line of code meet this new condition but don't know how.

unless (m{^([^\n]+)\n.*?\nwindow[^\n]*\n(.*)$}ms)

use strict;
use warnings;


open 'FH','</home/bwalker/final/real_data_test.txt' or die "Unable to open file: $!";

print "<table border=\"2\">\n";
while (<FH>) {
    my $file_cnt = scalar split /\n/;
    unless (m{^([^\n]+)\n.*?\nwindow[^\n]*\n(.*)$}ms) {
        warn "could not parse block:\n$_\n";
    my ($test, @lines) = ($1, split /\n+/, $2);
    my $sub_cnt = 1 + scalar @lines;
    print '<tr align="right" ><td width="50" align="left" rowspan="',scalar(@lines),"\">$test</td><td width=\"400\" align=\"left\">",shift(@lines),"</td></tr>\n",map({
"<tr align=\"right\" ><td width=\"400\" align=\"left\">$_</td></tr>\n" } @lines);
print "</table>\n";

Open in new window

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Correct.  It currently will not work without a line in between.  Changing the line to the below should fix the problem:

unless (m{^([^\n]+)\n(?:.*?\n)?window[^\n]*\n(.*)$}ms)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
areyouready344Author Commented:
that's better, thx wilcoxon
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.