Solved

regexp question

Posted on 2000-04-15
2
200 Views
Last Modified: 2010-05-18
Novice question here...
How can I open a file, entirely remove all lines which start w/ 'Path: ' (without the quotes), and write the file to a new filename. I have tried several variations on this code:

#!/usr/bin/perl

open NEWSFILE, "<news_file.txt" or die "Can't open news_file.txt";

open TEMPFILE, ">temp_file.txt" or die "Can't open temp_file.txt";
while (<NEWSFILE>) {
      tr/Path: //;
      print TEMPFILE;
}

close TEMPFILE;
close NEWSFILE;

but no luck.
thanks
0
Comment
Question by:frenomulax
2 Comments
 
LVL 3

Accepted Solution

by:
jkstill earned 50 total points
ID: 2719875
simply change these 2 lines:

  tr/Path: //;
  print TEMPFILE;

to:

  print TEMPFILE if ! /Path:/;


That's all it takes.

The /Path:/ says print a line, unless 'Path:' is in the line.

If you want it to only check at the beginning of the line, change it to /^Path:/.

The 'tr' command you used says to translate the characters 'Path:' to nothing, which is exactly what happened, nothing. :)
0
 

Author Comment

by:frenomulax
ID: 2719964
Thanks, just what I wanted.
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
perl script to count sepecial characters in a file 7 131
Perl 101 11 68
collecting information 2 129
Exchange 2010 Transport Rule Regex 28 88
I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now