change $/ - Perl

I have a datafile with the following format from which I need to extract parts of the text and copy to a seperate file :

[HTML]
Header (line 1)
---------------------------
(line 2starts)
Content - Content
Content - Content
Content - Content

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -
(line break)
Subheader
Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Co
(linebreak)
Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content -
( line2 ends)
----------------
Header (line 3)
-----------------
(line 4 starts)
Content - Content
Content - Content
Content - Content

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -
(line break)
Subheader
Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Co
(linebreak)
Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content
(line 4 ends)
[/HTML]

The file contains text that repeats the above pattern many times (is often very large).

I would like to change the record seperator so that it reads in the header as on line and the rest of the record as another line. --- isnt part of the file - just a visual cue I put in to demonstrate different lines. Is this possible?

Jun 21 '07 #1

Subscribe Post Reply

1542

miller

1,089

Expert 1GB

Dealing with the record separater is a rather advanced method for parsing a file. I suggest that you first attempt to parse the file using regular techniques. This will often demonstrate if it is even possible to do what you're wanting.

Also please note that your terminology is confusing. Instead of "line 1", I believe you mean record 1. As each of the main content sections contain "lines".

Expand|Select|Wrap|Line Numbers

 
for (my $line = <DATA>; ! eof(DATA);) {

    my $header = $line;
 
    my $content = '';

    while (defined($line = <DATA>)) {

        last if $line =~ /^Header/;

        $content .= $line;

    }
 
    print $header;

    print "Content = " . length($content) . " characters\n";

}
 
__DATA__

Header (section 1)

Content - Content

Content - Content

Content - Content

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -

Subheader

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Co

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content -

Header (section 2)

Content - Content

Content - Content

Content - Content

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -

Subheader

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Co

Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content -Content - Content

Output

Expand|Select|Wrap|Line Numbers

 
>perl scratch.pl

Header (section 1)

Content = 515 characters

Header (section 2)

Content = 523 characters

- Miller

Attached Files

scratch.txt (1.3 KB, 464 views)

Jun 21 '07 #2

Similar topics

Can't change datatype???

by: J.C. Flores | last post by:

Hello all, First of all, I must state that I'm new to SQL Server, but have been a long-time software guy for quite some time. Please excuse the potential simplicity of the solution to my...

Microsoft SQL Server

Change one image to 27 different images

by: Spike | last post by:

Hello! Im going to make a javascript for changing alot of images. But im not sure how to do it., where to start.. Ok, first.. this is the isue. I have 3 images(I call them 1a-3a). when u...

Javascript

Global variable lost in Change event Handler?

by: beanweed | last post by:

BACKGROUND ---------- I have an ASP.NET application having two panels. In one panel, an XML document, transformed using xsl, is displayed. In the other panel are some controls that allow a user...

.NET Framework

Change printer destination

by: Hank | last post by:

My Access 2000 code has been running for several years in our main plant. Now we need to install it, as a stand-along application, at remote sites, some of which are out of state. My problem is...

Microsoft Access / VBA

Changing Password to an account that has to change password at first logon using System.DirectoryServices

by: Fabrizio | last post by:

(Sorry for the crosspost, but I really don't know which is the right newsgroup!) Hi all, I try to change the password to a user that as to change the password at first logon: try {

C# / C Sharp

Change ClientSize need to change the Control Size?

by: active | last post by:

It appears to me that if I change the Control's client size the controls size does not change to agree with the new size. Does it work like the VB6 ScaleWidth and ScaleHeight? That is after I...

Visual Basic .NET

How to programmatically change properties of many controls on a form

by: Tom | last post by:

I am writing a Visual basic .Net database application. There are many forms that first let you select and look at a DB record and then when you click a "modify" button you are allowed to change...

Visual Basic .NET

Change domain user password?

by: J | last post by:

Hello. I apologize if this isn't the appropriate group for this question but I was wondering if it's possible to allow regular windows domain users to change their passwords through an .asp page? ...

ASP / Active Server Pages

How to change the RowSource in a SubReport

by: Simon | last post by:

Dear reader, The syntax for the VBA code to change the RowSource of a Master Report is: Me.RowSource = "TableOrQueryName"

Microsoft Access / VBA

Help requested for program to "calculate coin change"

by: monkey1001 | last post by:

my program is suppose to show my due change and i got it working but my change and coins are wrong how can i improve it thank you..(its supposed to be in java)

Java

Migrating Website to Cloud - Emmanuel Katto

by: emmanuelkatto | last post by:

Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel

General

Navigating the Data Structures and Algorithms (DSA)

by: BarryA | last post by:

What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...

Algorithms / Advanced Math

Looking to do Android software development, any suggestions? Is flutter better?

by: nemocccc | last post by:

hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?

General

How to build RAID in BIOS?

by: Hystou | last post by:

There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

Computer Hardware

Problem With Comparison Operator <=> in G++

by: Oralloy | last post by:

Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...

C / C++

Maximizing Business Potential: The Nexus of Website Design and Digital Marketing

by: jinu1996 | last post by:

In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...

Online Marketing

Discussion: How does Zigbee compare with other wireless protocols in smart home applications?

by: tracyyun | last post by:

Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...

General

AI Job Threat for Devs

by: agi2029 | last post by:

Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...

Career Advice

Access Europe - Using VBA to create a class based on a table - Wed 1 May

by: isladogs | last post by:

The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...

Microsoft Access / VBA