reg exp

From: Ken Chesak (datavector_at_hotmail.com)
Date: 08/30/04 

Date: 30 Aug 2004 08:59:11 -0700

Perl scipt is formatting text for HTML page. It changes things like
an & to &amp. But should not change &nbsp. It uses \ as an escape
character. So \&nbsp will become &nbsp. The final results are
correct, but is there a better way to do this?

Input file test.txt
 \HOME & \  BORN \& FREE BORN FREE ' \' HELP " \" w\\\\\\\w

1st change
1a= \HOME & \  BORN \& FREE BORN FREE '' \' HELP " \"
w\\\\\\\w
2nd changes
1b= HOME &   BORN & FREE BORN FREE '' ' HELP " "
w\\\w

#!/usr/local/bin/perl5
#
%encode = ( '&' => '&',
         '"' => '"',
         '\'' => '\'\'' );

$data = `cat test.txt`;
print "Oa= $data\n";
$data =~ s/(?<!\\)(.)/defined($encode{$1})?$encode{$1}:$1/eg;
print "1a= $data\n";
$data =~ s/(\\)(.)/$2/g;
print "1b= $data\n";

This is perl, v5.8.0 built for PA-RISC2.0 On HP-Unix.

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