• Explain what your problem is in detail
• Post an example of your input data
• Likewise with your expected output
• Show us what code you have tried
• Read the documentation (FAQS) before you post
• If the documentation confused you explain what where and how
• Read the following:
  • What makes a bad question?
  • File Input and Output
  • String Matching and Regular Expressions
  • Site How To
  • The comments on Turnsteps node are worth reading as well.

So Having said all of that, perhaps something like this will help you get started

use strict;
use warnings;

our $TEXTFILE="/some/path/file.ext";
open(TEXTFILE) || die "Failed to open $TEXTFILE:$!";

local $/;
my $text=<TEXTFILE>; # Slurp the whole file into one string

print "Matched!" if $text=~/match/;
[download]

Also you might try the following and see if it provides you with the information you need:

perldoc perlretut
perldoc perlopentut
perldoc perlre
perldoc perlop
perldoc perlvar
[download]

HTH

Yves / DeMerphq
--
Have you registered your Name Space?

demerphq++

I don't have anything to add, but the mere ++ vote felt like too little commendation on a great novice introduction. :)